Best SeaHorn Alternatives in 2026

Updated October 2026

20 apps from formal verification tools ranked against SeaHorn on the same published basis.

SeaHorn alternatives compared

#	App	Score	Free plan	From	Runs on
1	Z3	8.9	Free plan	Free	Android, API, Linux, Mac, self-hosted, Web, Windows
2	Rocq	8.2	Free plan	Free	Browser, Linux, Mac, Web, Windows
3	Isabelle	8.1	Free plan	Free	Linux, Mac, self-hosted, Windows
4	PVS	8.1	Free plan	Free	Linux, Mac, Windows
5	ACL2	7.4	No	—	Linux, Mac, self-hosted, Windows
6	Frama-C	7.2	No	—	Linux, Mac, Windows
7	CBMC	7.1	Free plan	Free	Linux, Mac, self-hosted, Windows
8	SPIN	7.0	Free plan	Free	Linux, Mac, Windows
9	Lean	6.9	No	—	Web, Windows, Mac, Linux
10	Why3	6.8	No	—	Web, Linux, Windows
11	UPPAAL	6.8	Free plan	Free	Linux, Mac, Windows
12	TLA+	6.7	No	—	Windows, Mac, Linux
13	Alloy Analyzer	6.7	Free plan	Free	API, Linux, Mac, Windows
14	K Framework	6.6	No	—	Linux, Mac
15	Dafny	6.5	No	—	Windows, Mac, Linux
16	cvc5	6.3	No	—	Web, Windows, Mac, Linux
17	CPAchecker	6.3	No	—	Windows, Mac, Linux
18	F*	6.2	No	—	Windows, Linux, Mac
19	PRISM	6.0	No	—	Windows, Mac, Linux
20	NuSMV	5.9	No	—	Windows, Mac, Linux

Make your app an alternative to SeaHorn

The sponsored alternative slot on this page is labelled Sponsored.

What is the best alternative to SeaHorn?

Z3, number 1 in formal verification tools with a score of 8.9 out of 10. The others here: Rocq, Isabelle, PVS and 16 more.

What is the best free alternative to SeaHorn?

Z3 is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation.