diff --git a/.travis.yml b/.travis.yml
index d3ccde3c2..b33582446 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,6 +18,7 @@ env:
   - TEST_SUITE=scripts/travis_test_cli.sh
   - TEST_SUITE=scripts/travis_test_printers.sh
   - TEST_SUITE=scripts/travis_test_slither_config.sh
+  - TEST_SUITE=scripts/travis_test_simil.sh
 branches:
   only:
   - master
diff --git a/scripts/travis_test_simil.sh b/scripts/travis_test_simil.sh
new file mode 100755
index 000000000..ccf332800
--- /dev/null
+++ b/scripts/travis_test_simil.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+### Install requisites
+
+pip3.6 install pybind11
+pip3.6 install https://github.com/facebookresearch/fastText/archive/0.2.0.zip
+
+### Test slither-simil
+
+DIR_TESTS="tests/simil"
+slither-simil info "" --filename $DIR_TESTS/../complex_func.sol --fname Complex.complexExternalWrites --solc solc-0.4.25 > test_1.txt 2>&1
+DIFF=$(diff test_1.txt "$DIR_TESTS/test_1.txt")
+if [  "$DIFF" != "" ] 
+then
+    echo "slither-simil failed"
+    cat test_1.txt
+    cat "$DIR_TESTS/test_1.txt"
+    exit -1
+fi
+
+rm test_1.txt
diff --git a/setup.py b/setup.py
index deb1447c9..4721aea29 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,8 @@ setup(
         'console_scripts': [
             'slither = slither.__main__:main',
             'slither-check-upgradeability = utils.upgradeability.__main__:main',
-            'slither-find-paths = utils.possible_paths.__main__:main'
+            'slither-find-paths = utils.possible_paths.__main__:main',
+            'slither-simil = utils.similarity.__main__:main'
         ]
     }
 )
diff --git a/tests/simil/test_1.txt b/tests/simil/test_1.txt
new file mode 100644
index 000000000..1c6a7bb7e
--- /dev/null
+++ b/tests/simil/test_1.txt
@@ -0,0 +1,2 @@
+INFO:Slither-simil:Function complexExternalWrites in contract Complex is encoded as:
+INFO:Slither-simil:new_contract (local_solc_variable(default)):=(temporary_variable) high_level_call high_level_call high_level_call high_level_call high_level_call new_contract (local_solc_variable(default)):=(temporary_variable) high_level_call new_contract (local_solc_variable(default)):=(temporary_variable) solidity_call(keccak256()) type_conversion(bytes4) low_level_call new_contract (local_solc_variable(default)):=(temporary_variable) solidity_call(keccak256()) type_conversion(bytes4) low_level_call
diff --git a/utils/similarity/__init__.py b/utils/similarity/__init__.py
new file mode 100644
index 000000000..b31b92c60
--- /dev/null
+++ b/utils/similarity/__init__.py
@@ -0,0 +1 @@
+from .model import load_model
diff --git a/utils/similarity/__main__.py b/utils/similarity/__main__.py
new file mode 100755
index 000000000..239b68b62
--- /dev/null
+++ b/utils/similarity/__main__.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+
+import argparse
+import logging
+import sys
+import traceback
+import operator
+
+from crytic_compile import cryticparser
+
+from .info     import info
+from .test     import test
+from .train    import train
+from .plot     import plot
+
+logging.basicConfig()
+logger = logging.getLogger("Slither-simil")
+
+modes = ["info", "test", "train", "plot"]
+
+def parse_args():
+    parser = argparse.ArgumentParser(description='Code similarity detection tool. For usage, see https://github.com/crytic/slither/wiki/Code-Similarity-detector')
+
+    parser.add_argument('mode',
+                        help="|".join(modes))
+
+    parser.add_argument('model',
+                        help='model.bin')
+
+    parser.add_argument('--filename',
+                        action='store',
+                        dest='filename',
+                        help='contract.sol')
+
+    parser.add_argument('--fname',
+                        action='store',
+                        dest='fname',
+                        help='Target function')
+
+    parser.add_argument('--ext',
+                        action='store',
+                        dest='ext',
+                        help='Extension to filter contracts')
+
+    parser.add_argument('--nsamples',
+                        action='store',
+                        type=int,
+                        dest='nsamples',
+                        help='Number of contract samples used for training')
+
+    parser.add_argument('--ntop',
+                        action='store',
+                        type=int,
+                        dest='ntop',
+                        default=10,
+                        help='Number of more similar contracts to show for testing')
+
+    parser.add_argument('--input',
+                        action='store',
+                        dest='input',
+                        help='File or directory used as input')
+
+    parser.add_argument('--version',
+                        help='displays the current version',
+                        version="0.0",
+                        action='version')
+
+    cryticparser.init(parser)
+
+    if len(sys.argv) == 1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
+
+    args = parser.parse_args()
+    return args
+
+# endregion
+###################################################################################
+###################################################################################
+# region Main
+###################################################################################
+###################################################################################
+
+def main():
+    args = parse_args()
+
+    default_log = logging.INFO
+    logger.setLevel(default_log)
+    
+    mode = args.mode
+
+    if mode == "info":
+        info(args)
+    elif mode == "train":
+        train(args) 
+    elif mode == "test":
+        test(args)
+    elif mode == "plot":
+        plot(args)
+    else:
+        logger.error('Invalid mode!. It should be one of these: %s' % ", ".join(modes))
+        sys.exit(-1)
+
+if __name__ == '__main__':
+    main()
+
+# endregion
diff --git a/utils/similarity/cache.py b/utils/similarity/cache.py
new file mode 100644
index 000000000..efb748c99
--- /dev/null
+++ b/utils/similarity/cache.py
@@ -0,0 +1,22 @@
+import sys
+
+try:
+    import numpy as np
+except ImportError:
+    print("ERROR: in order to use slither-simil, you need to install numpy")
+    print("$ pip3 install numpy --user\n")
+    sys.exit(-1)
+
+def load_cache(infile, nsamples=None):
+    cache = dict()
+    with np.load(infile) as data:
+        array = data['arr_0'][0]
+        for i,(x,y) in enumerate(array):
+            cache[x] = y
+            if i == nsamples:
+                break
+
+    return cache
+
+def save_cache(cache, outfile):
+    np.savez(outfile,[np.array(cache)])
diff --git a/utils/similarity/encode.py b/utils/similarity/encode.py
new file mode 100644
index 000000000..3ea47ca7c
--- /dev/null
+++ b/utils/similarity/encode.py
@@ -0,0 +1,214 @@
+import logging
+import os
+
+from slither import Slither
+from slither.core.declarations import Structure, Enum, SolidityVariableComposed, SolidityVariable, Function
+from slither.core.solidity_types import ElementaryType, ArrayType, MappingType, UserDefinedType
+from slither.core.variables.local_variable import LocalVariable
+from slither.core.variables.local_variable_init_from_tuple import LocalVariableInitFromTuple
+from slither.core.variables.state_variable import StateVariable
+from slither.slithir.operations import Assignment, Index, Member, Length, Balance, Binary, \
+    Unary, Condition, NewArray, NewStructure, NewContract, NewElementaryType, \
+    SolidityCall, Push, Delete, EventCall, LibraryCall, InternalDynamicCall, \
+    HighLevelCall, LowLevelCall, TypeConversion, Return, Transfer, Send, Unpack, InitArray, InternalCall
+from slither.slithir.variables import TemporaryVariable, TupleVariable, Constant, ReferenceVariable
+from .cache import load_cache
+
+simil_logger = logging.getLogger("Slither-simil")
+compiler_logger = logging.getLogger("CryticCompile")
+compiler_logger.setLevel(logging.CRITICAL)
+slither_logger = logging.getLogger("Slither")
+slither_logger.setLevel(logging.CRITICAL)
+
+def parse_target(target):
+    if target is None:
+        return None, None
+
+    parts = target.split('.')
+    if len(parts) == 1:
+        return None, parts[0]
+    elif len(parts) == 2:
+        return parts
+    else:
+        simil_logger.error("Invalid target. It should be 'function' or 'Contract.function'")
+
+def load_and_encode(infile, vmodel, ext=None, nsamples=None, **kwargs):
+    r = dict()
+    if infile.endswith(".npz"):
+        r = load_cache(infile, nsamples=nsamples)
+    else: 
+        contracts = load_contracts(infile, ext=ext, nsamples=nsamples)
+        for contract in contracts:
+            for x,ir in encode_contract(contract, **kwargs).items():
+                if ir != []:
+                    y = " ".join(ir)
+                    r[x] = vmodel.get_sentence_vector(y)
+
+    return r
+
+def load_contracts(dirname, ext=None, nsamples=None, **kwargs):
+    r = []
+    walk = list(os.walk(dirname))
+    for x, y, files in walk:
+        for f in files: 
+            if ext is None or f.endswith(ext):
+                r.append(x + "/".join(y) + "/" + f)
+
+    if nsamples is None:
+        return r
+    else:
+        # TODO: shuffle
+        return r[:nsamples]
+
+def ntype(_type):
+    if isinstance(_type, ElementaryType):
+        _type = str(_type)
+    elif isinstance(_type, ArrayType):
+        if isinstance(_type.type, ElementaryType):
+            _type = str(_type)
+        else:
+            _type = "user_defined_array"
+    elif isinstance(_type, Structure):
+        _type = str(_type)
+    elif isinstance(_type, Enum):
+        _type = str(_type)
+    elif isinstance(_type, MappingType):
+        _type = str(_type)
+    elif isinstance(_type, UserDefinedType):
+        _type = "user_defined_type"  # TODO: this could be Contract, Enum or Struct
+    else:
+        _type = str(_type)
+
+    _type = _type.replace(" memory","")
+    _type = _type.replace(" storage ref","")
+
+    if "struct" in _type:
+        return "struct"
+    elif "enum" in _type:
+        return "enum"
+    elif "tuple" in _type:
+        return "tuple"
+    elif "contract" in _type:
+        return "contract"
+    elif "mapping" in _type:
+        return "mapping"
+    else:
+        return _type.replace(" ","_")
+
+def encode_ir(ir):
+    # operations
+    if isinstance(ir, Assignment):
+        return '({}):=({})'.format(encode_ir(ir.lvalue), encode_ir(ir.rvalue))
+    if isinstance(ir, Index):
+        return 'index({})'.format(ntype(ir._type)) 
+    if isinstance(ir, Member):
+        return 'member' #.format(ntype(ir._type))
+    if isinstance(ir, Length):
+        return 'length'
+    if isinstance(ir, Balance):
+        return 'balance'
+    if isinstance(ir, Binary):
+        return 'binary({})'.format(ir.type_str)
+    if isinstance(ir, Unary):
+        return 'unary({})'.format(ir.type_str) 
+    if isinstance(ir, Condition):
+        return 'condition({})'.format(encode_ir(ir.value))
+    if isinstance(ir, NewStructure):
+        return 'new_structure'
+    if isinstance(ir, NewContract):
+        return 'new_contract'
+    if isinstance(ir, NewArray):
+        return 'new_array({})'.format(ntype(ir._array_type)) 
+    if isinstance(ir, NewElementaryType):
+        return 'new_elementary({})'.format(ntype(ir._type)) 
+    if isinstance(ir, Push):
+        return 'push({},{})'.format(encode_ir(ir.value), encode_ir(ir.lvalue))
+    if isinstance(ir, Delete):
+        return 'delete({},{})'.format(encode_ir(ir.lvalue), encode_ir(ir.variable))
+    if isinstance(ir, SolidityCall):
+        return 'solidity_call({})'.format(ir.function.full_name)
+    if isinstance(ir, InternalCall):
+        return 'internal_call({})'.format(ntype(ir._type_call)) 
+    if isinstance(ir, EventCall): # is this useful?
+        return 'event'
+    if isinstance(ir, LibraryCall):
+        return 'library_call'
+    if isinstance(ir, InternalDynamicCall):
+        return 'internal_dynamic_call'
+    if isinstance(ir, HighLevelCall): # TODO: improve
+        return 'high_level_call'
+    if isinstance(ir, LowLevelCall): # TODO: improve
+        return 'low_level_call'
+    if isinstance(ir, TypeConversion):
+        return 'type_conversion({})'.format(ntype(ir.type))
+    if isinstance(ir, Return): # this can be improved using values
+        return 'return' #.format(ntype(ir.type))
+    if isinstance(ir, Transfer):
+        return 'transfer({})'.format(encode_ir(ir.call_value))
+    if isinstance(ir, Send):
+        return 'send({})'.format(encode_ir(ir.call_value))
+    if isinstance(ir, Unpack): # TODO: improve
+        return 'unpack'
+    if isinstance(ir, InitArray): # TODO: improve
+        return 'init_array'
+    if isinstance(ir, Function): # TODO: investigate this
+        return 'function_solc'
+
+    # variables
+    if isinstance(ir, Constant):
+        return 'constant({})'.format(ntype(ir._type))
+    if isinstance(ir, SolidityVariableComposed):
+        return 'solidity_variable_composed({})'.format(ir.name)
+    if isinstance(ir, SolidityVariable):
+        return 'solidity_variable{}'.format(ir.name)
+    if isinstance(ir, TemporaryVariable):
+        return 'temporary_variable'
+    if isinstance(ir, ReferenceVariable):
+        return 'reference({})'.format(ntype(ir._type)) 
+    if isinstance(ir, LocalVariable):
+        return 'local_solc_variable({})'.format(ir._location) 
+    if isinstance(ir, StateVariable):
+        return 'state_solc_variable({})'.format(ntype(ir._type))
+    if isinstance(ir, LocalVariableInitFromTuple):
+        return 'local_variable_init_tuple'
+    if isinstance(ir, TupleVariable):
+        return 'tuple_variable'
+
+    # default
+    else:
+        simil_logger.error(type(ir),"is missing encoding!")
+        return ''
+ 
+def encode_contract(cfilename, **kwargs):
+    r = dict()
+
+    # Init slither
+    try:
+        slither = Slither(cfilename, **kwargs)
+    except:
+        simil_logger.error("Compilation failed for %s using %s", cfilename, kwargs['solc'])
+        return r
+
+    # Iterate over all the contracts
+    for contract in slither.contracts:
+
+        # Iterate over all the functions
+        for function in contract.functions_not_inherited:
+
+            if function.nodes == []:
+                continue
+
+            x = (cfilename,contract.name,function.name)
+
+            r[x] = []
+
+            # Iterate over the nodes of the function
+            for node in function.nodes:
+                # Print the Solidity expression of the nodes
+                # And the SlithIR operations
+                if node.expression:
+                    for ir in node.irs:
+                        r[x].append(encode_ir(ir))
+    return r
+
+
diff --git a/utils/similarity/info.py b/utils/similarity/info.py
new file mode 100644
index 000000000..e250aa991
--- /dev/null
+++ b/utils/similarity/info.py
@@ -0,0 +1,54 @@
+import logging
+import sys
+import os.path
+import traceback
+
+from .model  import load_model
+from .encode import parse_target, encode_contract
+
+logging.basicConfig()
+logger = logging.getLogger("Slither-simil")
+
+def info(args):
+
+    try:
+
+        model = args.model
+        if os.path.isfile(model): 
+            model = load_model(model)
+        else:
+            model = None
+
+        filename = args.filename
+        contract, fname = parse_target(args.fname)
+        solc = args.solc
+        
+        if filename is None and contract is None and fname is None:
+            logger.info("%s uses the following words:",args.model)
+            for word in model.get_words():
+                logger.info(word)
+            sys.exit(0)
+
+        if filename is None or contract is None or fname is None:
+            logger.error('The encode mode requires filename, contract and fname parameters.')
+            sys.exit(-1)
+
+        irs = encode_contract(filename, **vars(args))
+        if len(irs) == 0:
+            sys.exit(-1)
+        
+        x = (filename,contract,fname)
+        y = " ".join(irs[x])
+
+        logger.info("Function {} in contract {} is encoded as:".format(fname, contract))
+        logger.info(y)
+        if model is not None:
+            fvector = model.get_sentence_vector(y)
+            logger.info(fvector)
+
+    except Exception:
+        logger.error('Error in %s' % args.filename)
+        logger.error(traceback.format_exc())
+        sys.exit(-1)
+
+
diff --git a/utils/similarity/model.py b/utils/similarity/model.py
new file mode 100644
index 000000000..4f3412113
--- /dev/null
+++ b/utils/similarity/model.py
@@ -0,0 +1,9 @@
+import sys
+
+try:
+    from fastText import load_model
+    from fastText import train_unsupervised
+except ImportError:
+    print("ERROR: in order to use slither-simil, you need to install fastText 0.2.0:")
+    print("$ pip3 install https://github.com/facebookresearch/fastText/archive/0.2.0.zip --user\n")
+    sys.exit(-1)
diff --git a/utils/similarity/plot.py b/utils/similarity/plot.py
new file mode 100644
index 000000000..05d8bf921
--- /dev/null
+++ b/utils/similarity/plot.py
@@ -0,0 +1,78 @@
+import logging
+import sys
+import traceback
+import operator
+import numpy as np
+import random
+
+from .model  import load_model   
+from .encode import load_and_encode, parse_target
+
+try:
+    from sklearn import decomposition
+    import matplotlib.pyplot as plt
+except ImportError:
+    decomposition = None
+    plt = None
+
+logger = logging.getLogger("Slither-simil")
+
+def plot(args):
+
+    if decomposition is None or plt is None:
+        logger.error("ERROR: In order to use plot mode in slither-simil, you need to install sklearn and matplotlib:")
+        logger.error("$ pip3 install sklearn matplotlib --user")
+        sys.exit(-1)
+
+    try:
+
+        model = args.model
+        model = load_model(model)
+        filename = args.filename
+        #contract = args.contract
+        contract, fname = parse_target(args.fname)
+        #solc = args.solc
+        infile = args.input
+        #ext = args.filter
+        #nsamples = args.nsamples
+
+        if fname is None or infile is None:
+            logger.error('The plot mode requieres fname and input parameters.')
+            sys.exit(-1)
+
+        logger.info('Loading data..')
+        cache = load_and_encode(infile, **vars(args))
+
+        data = list()
+        fs = list()
+
+        logger.info('Procesing data..')
+        for (f,c,n),y in cache.items():
+            if (c == contract or contract is None) and n == fname:
+                fs.append(f)
+                data.append(y)
+
+        if len(data) == 0:
+            logger.error('No contract was found with function %s', fname)
+            sys.exit(-1)
+
+        data = np.array(data)
+        pca = decomposition.PCA(n_components=2)
+        tdata = pca.fit_transform(data)
+
+        logger.info('Plotting data..')
+        plt.figure(figsize=(20,10))
+        assert(len(tdata) == len(fs))
+        for ([x,y],l) in zip(tdata, fs):
+            x = random.gauss(0, 0.01) + x
+            y = random.gauss(0, 0.01) + y
+            plt.scatter(x, y, c='blue')
+            plt.text(x-0.001,y+0.001, l)
+
+        logger.info('Saving figure to plot.png..')
+        plt.savefig('plot.png', bbox_inches='tight')
+ 
+    except Exception:
+        logger.error('Error in %s' % args.filename)
+        logger.error(traceback.format_exc())
+        sys.exit(-1)
diff --git a/utils/similarity/similarity.py b/utils/similarity/similarity.py
new file mode 100644
index 000000000..4cc3f2b35
--- /dev/null
+++ b/utils/similarity/similarity.py
@@ -0,0 +1,6 @@
+import numpy as np
+
+def similarity(v1, v2):
+    n1 = np.linalg.norm(v1)
+    n2 = np.linalg.norm(v2)
+    return np.dot(v1, v2) / n1 / n2
diff --git a/utils/similarity/test.py b/utils/similarity/test.py
new file mode 100755
index 000000000..15a39cc13
--- /dev/null
+++ b/utils/similarity/test.py
@@ -0,0 +1,54 @@
+import argparse
+import logging
+import sys
+import traceback
+import operator
+import numpy as np
+
+from .model      import load_model
+from .encode     import encode_contract, load_and_encode, parse_target
+from .cache      import save_cache
+from .similarity import similarity
+
+logger = logging.getLogger("Slither-simil")
+
+def test(args):
+
+    try:
+        model = args.model
+        model = load_model(model)
+        filename = args.filename
+        contract, fname = parse_target(args.fname) 
+        infile = args.input
+        ntop = args.ntop
+
+        if filename is None or contract is None or fname is None or infile is None:
+            logger.error('The test mode requires filename, contract, fname and input parameters.')
+            sys.exit(-1)
+
+        irs = encode_contract(filename, **vars(args))
+        if len(irs) == 0:
+            sys.exit(-1)
+
+        y = " ".join(irs[(filename,contract,fname)])
+        
+        fvector = model.get_sentence_vector(y)
+        cache = load_and_encode(infile, model, **vars(args))
+        #save_cache("cache.npz", cache)
+
+        r = dict()
+        for x,y in cache.items():
+            r[x] = similarity(fvector, y)
+
+        r = sorted(r.items(), key=operator.itemgetter(1), reverse=True)
+        logger.info("Reviewed %d functions, listing the %d most similar ones:", len(r), ntop)
+        format_table = "{: <65} {: <20} {: <20} {: <10}"
+        logger.info(format_table.format(*["filename", "contract", "function", "score"]))
+        for x,score in r[:ntop]:
+            score = str(round(score, 3))
+            logger.info(format_table.format(*(list(x)+[score])))
+
+    except Exception:
+        logger.error('Error in %s' % args.filename)
+        logger.error(traceback.format_exc())
+        sys.exit(-1)
diff --git a/utils/similarity/train.py b/utils/similarity/train.py
new file mode 100755
index 000000000..e810450a6
--- /dev/null
+++ b/utils/similarity/train.py
@@ -0,0 +1,54 @@
+import argparse
+import logging
+import sys
+import traceback
+import operator
+import os
+
+from .model   import train_unsupervised
+from .encode  import encode_contract, load_contracts
+from .cache   import save_cache
+
+logger = logging.getLogger("Slither-simil")
+
+def train(args):
+
+    try:
+        last_data_train_filename = "last_data_train.txt"
+        model_filename = args.model
+        dirname = args.input
+        nsamples = args.nsamples
+
+        if dirname is None:
+            logger.error('The train mode requires the input parameter.')
+            sys.exit(-1)
+
+        contracts = load_contracts(dirname, **vars(args))
+        logger.info('Saving extracted data into %s', last_data_train_filename)
+        cache = []
+        with open(last_data_train_filename, 'w') as f:
+            for filename in contracts:
+                #cache[filename] = dict()
+                for (filename, contract, function), ir in encode_contract(filename, **vars(args)).items():
+                    if ir != []:
+                        x = " ".join(ir)
+                        f.write(x+"\n")
+                        cache.append((os.path.split(filename)[-1], contract, function, x))
+
+        logger.info('Starting training')
+        model = train_unsupervised(input=last_data_train_filename, model='skipgram')
+        logger.info('Training complete')
+        logger.info('Saving model')
+        model.save_model(model_filename)
+
+        for i,(filename, contract, function, irs) in enumerate(cache):
+            cache[i] = ((filename, contract, function), model.get_sentence_vector(irs))
+
+        logger.info('Saving cache in cache.npz')
+        save_cache(cache, "cache.npz")
+        logger.info('Done!')
+ 
+    except Exception:
+        logger.error('Error in %s' % args.filename)
+        logger.error(traceback.format_exc())
+        sys.exit(-1)