Best Formal Verification Tools in 2026

Updated 8 October 2026

33 formal verification tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.

33ranked

0free plans on this page

8 Oct 2026last checked

Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score

26 Satisfiability.jl No phone app RecognisedPhone appDocumentedFree plan 5.3 Verification method: symbolicSupported formalisms: theorem-proving
27 SeaHorn No phone app RecognisedPhone appDocumentedFree plan 5.3 Verification method: hybridSupported formalisms: invariantsCounterexamples: Yes
28 TLA+ No phone app RecognisedPhone appDocumentedFree plan 5.3 Verification method: hybridSupported formalisms: invariantsCounterexamples: Yes
29 VeriFast No phone app RecognisedPhone appDocumentedFree plan 5.3 Verification method: symbolicSupported formalisms: contracts
30 Why3 No phone app RecognisedPhone appDocumentedFree plan 5.3 Verification method: deductiveSupported formalisms: contractsCounterexamples: Yes
31 Agda No phone app RecognisedPhone appDocumentedFree plan 5.2 Verification method: deductiveSupported formalisms: theorem-proving
32 cvc5 No phone app RecognisedPhone appDocumentedFree plan 5.2 Supported formalisms: theorem-proving
33 F* No phone app RecognisedPhone appDocumentedFree plan 5.2 Verification method: hybridSupported formalisms: theorem-proving

Compare all 8 in a table

#	App	Score	Free plan	Free plan	Paid from	Verification method	Supported formalisms
26	Satisfiability.jl	5.3	No	Yes	—	symbolic	theorem-proving
27	SeaHorn	5.3	No	—	—	hybrid	invariants
28	TLA+	5.3	No	—	—	hybrid	invariants
29	VeriFast	5.3	No	—	—	symbolic	contracts
30	Why3	5.3	No	—	—	deductive	contracts
31	Agda	5.2	No	—	—	deductive	theorem-proving
32	cvc5	5.2	No	—	—	—	theorem-proving
33	F*	5.2	No	—	—	hybrid	theorem-proving

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