Comparison
Driftlock vs Dependabot: Alerting tool vs. self-hosted overnight PR desk.
Dependabot is a GitHub-native alerting tool that opens automated dependency-update pull requests and stops there: a human reviews, merges, and triages whatever landed overnight. Driftlock reads the engineering signals Dependabot already produces — the dependency alert, the CI failure, the CVE feed, the on-call page — and turns each into a signed, audit-linked pull request on the customer’s own protected branches, inside a hermetic sandbox, with a seven-column audit trail a regulator replays on customer storage. Where Dependabot optimises for early alerting, Driftlock optimises for the morning inbox: one PR per signal, every PR replayable.
Trigger
Driftlock reads the Dependabot alert alongside the three other named signal sources (CI failure, CVE feed, on-call page) — one PR per signal.
Audit
Seven per-PR columns — alert id, sandbox run hash, SBOM hash, approver chain, signature, diff bytes, triage verdict — replayable on your storage tier.
Identity
Commits sign with your cosign key in your KMS or HSM. Keys rotate on your schedule.
What this comparison covers
Dependabot runs as a GitHub App. Every week it scans each repository’s dependency manifest, opens a pull request per outdated or vulnerable package, and waits — the merge decision, the patch review, the CVE follow-up, and the on-call handoff all stay with the developer. For small repos with low dependency churn, that posture is fine; for an internal monorepo where the alert volume is the problem, the shape is the problem.
Driftlock reads the same signal surface — Dependabot alerts among the four named inputs — and does the next step. Each trigger becomes one tested, signed pull request on a protected branch. The seven-column audit trail a Driftlock PR ships (alert id, sandbox run hash, SBOM hash, approver chain, signature, diff bytes, triage verdict) is the column set Dependabot does not produce, and is the column set a SOC 2 reviewer, a FedRAMP-style auditor, or a regulated buyer’s platform team will actually read.
Feature-by-feature
Seven axes where the posture diverges.
The table names one row per axis — overnight automation, sandbox PR testing, signed PRs + SBOM, audit trail, RBAC controls, morning digest, pricing model — and states both sides. No feature checklist, no marketing re-framing.
| Axis | Dependabot | Driftlock |
|---|---|---|
Axis overnight automation | Dependabot Opens a dependency-update pull request per package, runs the repository’s CI on each, and stops there. CVE follow-ups, CI-failure triage, and on-call regressions are out of scope. | Driftlock Reads Dependabot alerts alongside the three other named signal sources (CI failure, CVE feed, on-call page). Each trigger becomes one tested, signed pull request on a protected branch before the morning standup. |
Axis sandbox PR testing | Dependabot Runs the repository’s native CI on each dependency-update PR; the sandbox is whatever CI the team already operates, baked-in cache not included. | Driftlock Runs every proposed diff — including Dependabot-style dependency bumps — inside a hermetic sandbox that mounts the existing monorepo’s toolchain and test cache, and replays the original regression before the PR opens. |
Axis signed PRs + SBOM | Dependabot Dependabot does not natively sign dependency-update commits with a key held outside GitHub; SBOM emission is delegated to repository-side tooling. | Driftlock Signs every pull request (Dependabot-driven or otherwise) with the customer’s cosign key, kept in the customer’s KMS or HSM, with key rotation on the customer’s schedule; emits an SBOM hash per PR recorded alongside the diff and the signature. |
Axis audit trail / compliance | Dependabot Records merge events on the GitHub side; replay requires GitHub as the intermediary and does not natively separate trigger, sandbox hash, SBOM hash, and signature into replayable columns. | Driftlock Records seven per-PR columns (alert id, sandbox run hash, SBOM hash, approver chain, signature, diff bytes, triage verdict) replayable on the customer’s storage tier without a Driftlock-managed control plane. |
Axis RBAC controls | Dependabot Operates as a GitHub App with repo-scoped permissions; the RBAC shape is GitHub’s, and every role-action combination is mediated through GitHub’s permission model. | Driftlock Carries an explicit RBAC matrix (admin, reviewer, approver, observer) with one config snippet per role, surfaced at /docs/compliance#rbac-matrix — keyed to the customer’s IdP, with audit-log retention on the customer’s storage tier. |
Axis morning digest | Dependabot Surfaces a list of open Dependabot PRs in the developer’s GitHub inbox; the daily review is whatever the reviewer assembles themselves. | Driftlock One PR per signal lands in the team’s review queue on a protected branch; the PR body links the trigger, the SBOM, and the reviewer workflow so a regulator-side replay and a developer-side review start from the same artefact. |
Axis pricing model | Dependabot Free as part of GitHub; cost is the labour cost of the developer who reviews, merges, and triages each alert. | Driftlock Per-deployment subscription priced against the engineering labour it replaces; the rate card is published at /pricing and the cost-comparison table at /pricing#cost-comparison models the swap. |
7 axes · posture-level · no feature checklist
Where Driftlock differs
Three posture-level differences worth naming.
Audit replay stays on your storage tier.
The seven per-PR columns a Driftlock pull request records are written to the customer’s own object storage, readable by a regulator’s tooling, without going through a Driftlock control plane. Dependabot’s merge log lives on the GitHub control plane; replays cross tenant boundaries.
RBAC is a config artefact, not a permission graph.
Driftlock carries an RBAC matrix keyed to the customer’s IdP with one config snippet per role. Dependabot operates inside GitHub’s permission graph; the role-action combinations exist, but they are not surfaced as an audit artefact the same way.
PRs arrive signed, every time.
Driftlock signs with the customer’s cosign key, kept in the customer’s KMS or HSM. Dependabot’s commit identity follows the repository’s configured signing setting, which is optional and not customer-key-managed by default.
See it on your stack
Compare on a real monorepo, not a slide deck.
The architecture page names the four signal sources the watcher reads; the governance page enumerates the seven per-PR columns a regulator replays. Point Driftlock at the Dependabot alerts already firing in your monorepo on a ten-day scoped trial — you'll see the diffs Driftlock ships and the audit trail your reviewers sign.