Best Software Licensing APIs for Developers (2026)
We're one of the options in this roundup, so we won't pretend to be a neutral third party — but we're also not going to declare ourselves the winner and call it a day. This covers four real licensing APIs, what each is actually built for, and where each honestly falls short. Pricing below is sourced directly from each vendor's own current pricing page, checked September 15-16, 2026 — verify current numbers directly before deciding, since vendor pricing changes.
PermitCore
€0 (Free, 50 activations/mo) → €29 (Starter, 1,000/mo) → €59 (Professional, 10,000/mo) → €299 (Enterprise, unlimited + self-hosted). Client-side AES-256-GCM key encryption, a built-in 0%-commission Stripe storefront, and 6 official SDKs (.NET, Node.js, Python, Java, C++, PHP). Genuinely narrower than some competitors on SDK-language breadth and self-hosting flexibility (see below) — strongest fit if you want licensing and a direct-to-customer storefront in one product, or specifically want zero-knowledge key storage.
Keygen
Free "Dev" tier: 100 active licensed users, 10 product releases. Paid tiers price through a live slider calculator with no fixed published number, stated flat-fee with no revenue commission. Genuinely ahead on self-hosting: a free, open-source Community Edition exists alongside the paid Enterprise Edition — the most open self-hosting path of the four covered here. No built-in storefront or client-side key encryption described on their pricing page.
Devolens (formerly Cryptolens)
Free (€0, 10 active licenses) → Business (€299/mo, 5,000 licenses) → Scale (€699/mo, 10,000) → Enterprise (custom). Cryptolens itself is still the platform's name; Devolens is the newly created parent brand. Supports subscription, usage-based, floating, node-locked, SDK, offline, and user-account licensing — a broad model set. No built-in storefront, client-side encryption, or self-hosting option described at any tier.
LicenseSpring
Free ($0, 100 licenses) → Business Starter ($199/mo, 1,000 licenses) → Business Plus ($750/mo, 10,000 licenses) → Enterprise (custom, on-premise floating server, air-gapped support). Genuinely ahead on SDK breadth — 9 languages/platforms including Go, Swift, native Android, and Unity, versus the 6 most of the others in this list cover. Also runs a startup discount program (up to 75% off for two years).
What we didn't include, and why
A credible "best of" list should only include vendors we've actually verified pricing and features for directly, not names recycled from someone else's roundup. We're not going to pad this list with unverified entries just to make it longer — if you know of a licensing platform you'd like us to research properly and add, that's exactly the kind of addition we'd make carefully, not casually.
How to actually choose
None of these four is objectively "best" — they're built around different priorities. If self-hosting flexibility matters most to you, Keygen's open CE tier is worth a close look. If SDK language breadth matters most (especially Go, Swift, or Unity), LicenseSpring covers more ground. If you want licensing and a direct customer storefront bundled with zero-knowledge key storage, that's specifically what PermitCore is built around. See our full sourced comparisons for Keygen, Devolens/Cryptolens, and LicenseSpring for the full feature-by-feature breakdown, or our evaluation checklist if you want to run your own comparison against a different vendor entirely.