Experiment-record software with a review workflow is a state-machine purchase, not a notebook-beauty contest. Shortlist the system that can show draft, in-review, rejected, and signed on one real experiment, with a named signer role and a lock after the signature. A comment box on a live page is not that machine. Leaving eLabJournal is a reconstruction problem on the named-exit page. Defining an audit trail is a different page.
Score the Review State Machine, Not a Prettier Notebook
The search is how to choose experiment record software with review workflow. The subject is the category: record software that can route an experiment through review. The brand is not the subject. Prefer a system that can open one signed experiment and answer four questions without a slide deck: what state is this record in, who is allowed to sign it, what happens if it is rejected, and can anyone still edit it after the signature? If the demo cannot do that on your protocol, you do not have a review workflow. You have a nicer place to type.

Signals Notebook's public product page lists comment, review, and approve with electronic signatures. That list is useful only as a prompt. It is not proof that rejection reopens a draft or that a signed body is locked. Treat every vendor sentence the same way. Ask to see the states on one of your experiments.
Four Checks: States, Roles, Rejection, Lock
Run these checks in a live demo. Write the answers down. A missing answer is a no.
| Check | What to ask | Fail signal |
| Review states | Can the record itself be draft, in-review, rejected, or signed? | Status lives only in a comment color or a Slack thread. |
| Signer roles | Are witness, PI, and QA distinct named roles? | Everyone who can comment is an "approver." |
| Rejection loop | Does reject return an editable draft with a stored reason? | A critical comment never forces a rewrite. |
| Lock after sign | After sign, is silent edit blocked? | The signed body can still be rewritten. |
One pharma-facing ELN page advertises structured review chains for PI, QA, and regulatory affairs. Use that as a role prompt, not as a compliance certificate. SciSure's GxP note is the boundary that belongs on this page: map protocol to experiment to review, then remember that no ELN vendor makes a laboratory GxP compliant by itself. The organization still owns intended use, SOPs, training, and oversight. 21 CFR Part 11 is a regulation. It is not a product badge you buy with the seat.
Three Review Postures, Same Labels
Most labs already live in one of three postures. Score them on the same four labels. This is not a rematch of SciNote against eLabJournal, and it is not an alternatives rank.
| Dimension | State-machine review ELN | Comment-thread notebook | Email or PDF witness |
| Review states | Named states on the record | Usually none; comments sit on a live page | Signed/unsigned lives on the PDF, not the notebook |
| Signer roles | PI, witness, or QA can be distinct | Anyone who can comment can look like a reviewer | Named in the email, not in the ELN ACL |
| Rejection loop | Reject returns an editable draft with a reason | A critique may never force a rewrite | A reject email may never reopen the page |
| Lock after sign | Signed record is not silently editable | Typically absent | PDF may lock; the notebook copy may not |
| When it fits | The lab must show who approved what after a reject | Discovery discussion without a signed state | Witness already lives on paper or email and will not move yet |
| What it does not buy | Part 11 completion | A review workflow | One system of record |
Prefer the state-machine posture when a sponsor, QA group, or internal audit will ask who signed the final body. Prefer the comment-thread posture only when the lab admits it is buying discussion, not sign-off. Prefer email or PDF witness when the signature program is not moving this quarter — and write down that reconstruction now requires two systems. An editable legacy plus a stamped PDF is not a review workflow. It is a split brain.
Software Does Not Finish the Signature Program
Buying experiment-record software with a review workflow does not complete 21 CFR Part 11. Features can support documentation, trails, and access control. They do not replace intended-use validation, SOPs, or training. SciSure says the same thing about GxP. After the four checks are scored, a named product may enter. ZettaNote is Zettalab's electronic laboratory notebook for structured experiment documentation. It is one record system to score against states, roles, rejection, and lock — not the winner of a prettier-notebook contest. ELN versus LIMS owns the object split. This page only decides whether the record software can run a review. If the demo cannot reject and lock one of your experiments, you do not have a next system. You have a brochure.
Frequently Asked Questions
Is a comment thread the same as a review workflow?
No. Comments can discuss a page. A review workflow needs named states, a signer role, and a path that can reject and lock.
Does experiment-record software with review complete 21 CFR Part 11?
No. Features can support documentation, trails, and access control. The laboratory still owns intended use, SOPs, training, and oversight.