Best dev frameworks in 2026

Maintenance That Is Actually Happening — 10/10

Foundry is the reference implementation this rubric is calibrated against, so a near-top score is unsurprising and is not a differentiating discovery. Adversarial re-verification confirmed the great majority of the draft — the 2,698,765-byte docs build, all eight "pricing" hits, all six testing capabilities, the four release sidecars and their exact contents, the Sigstore text — but produced one genuine downgrade and one false absence. THE DOWNGRADE: lock-in moves 9 -> 8. The whole docs build contains exactly one migration guide and it is a v1.0 version-upgrade guide; the Hardhat interop is a subsection plus a CLI flag, both pointing INTO Foundry, and the first-party plugin repo is a Public archive whose default branch last committed 2024-08-01. Foundry documents how to arrive, not how to leave — the rubric's 9-10 band demands a named interop or migration document, and this is squarely the 7-8 band, held at its top only because contract source is plain portable Solidity and Hardhat 3 runs Foundry-compatible Solidity tests. Weighted total moves 9.75 -> 9.50. Two further limits. (1) The stable train is far slower than the nightly train: v1.7.1 (2026-05-08) is three months and four days old, and I confirmed no newer stable exists (v1.7.2 and v1.8.0 both 404). The 10 on cadence is earned by ten consecutive dated nightlies and 953 commits; a buyer who pins stable rather than nightly should read that cadence as 7-8. (2) I scored the framework only — the MPP payment-gated RPC guide (rpc_nodes) and Starknet Foundry/snforge were read and deliberately excluded.

No pricing is published, because the toolchain is free and open source — a finding, not a research gap, and I attacked it rather than accepting it. https://getfoundry.sh/pricing and https://www.getfoundry.sh/pricing both return HTTP 404 (re-checked 2026-08-12; a bogus control path /this/path/is/bogus-xyz also returns 404, confirming the site does 404 rather than fall back). A site-wide search of the complete docs build (llms-full.txt, 2,698,765 bytes, re-fetched 2026-08-12) finds exactly eight occurrences of "pricing"/"Pricing" and NONE refers to the cost of the tool. I enumerated all eight: "Configure gas limits and pricing for tests"; four hits on a sample contract `src/Pricing.sol` / `test/Pricing.t.sol` in the coverage guide; "opcode repricing" in a linter rule; and — a hit the draft missed — "The TIP-20 quote token address used for exchange pricing" in Tempo CLI help. I widened the attack beyond "pricing": the docs build contains ZERO occurrences of "enterprise", "Enterprise", "subscription", "license key", "paid plan", "free tier", "per seat", "billing" or "Pro plan", and the homepage contains no pricing, enterprise or billing link. The repository is dual-licensed — both LICENSE-APACHE (10,757 bytes) and LICENSE-MIT (1,067 bytes) return HTTP 200 from raw.githubusercontent.com/foundry-rs/foundry/master/, and the repo page shows Apache-2.0 and MIT. Acquisition is a free download: /introduction/installation reads "Foundry is installed using **foundryup**, the official installer and version manager." followed by `$ curl -L https://getfoundry.sh/install | bash` (endpoint live, 10,888 bytes) then `$ foundryup`; no payment step exists anywhere in the flow. NOTE, deliberately excluded from scoring: the docs reference "[MPP-backed RPC endpoints](/guides/mpp) for paid RPC configuration", whose page (live, titled "MPP-backed RPC endpoints") covers "HTTP 402 payment-gated RPC endpoints through the Machine Payments Protocol" — that is a hosted RPC endpoint (rpc_nodes), a banned sibling category, not a charge for the framework.