Tool profile
Cradle: cost, fit and limits
Cradle is a requirements management and systems engineering product made by Structured Software Systems Limited (3SL) that supports requirements, model-based systems engineering, configuration management and document publishing in desktop, enterprise and SaaS editions. The vendor sells editions through purchase pages and a SaaS subscription.
What to know first
Cradle is sold as RM and SE editions in Desktop, Pro and Enterprise forms plus a SaaS subscription, and the homepage shows no prices for any of them. A free trial is available by download without a stated length. The page names no AI feature. Its strength is breadth for systems engineers: over 20 diagram notations, baselines and a formal document publisher.
Cradle at a glance
| Maker | Structured Software Systems Limited, United Kingdom |
|---|---|
| Free plan | Free trial only |
| Entry price | Quote only |
| API access | No |
| Category | Best AI Requirements Management Software in 2026, rank 10 of 10 |
| Website | threesl.com |
Who Cradle is best for
Systems engineering groups using SysML
More than 20 diagram notations, including SysML, UML and IDEF, put modeling and requirements in one place for teams doing model-based systems engineering.
Teams that receive requirements as documents
Document Loader imports requirements from external documents and detects differences when a document is revised, which helps with customer specs that change often.
Programs that publish formal documents
Document Publisher produces documents with cover pages, tables of contents and traceability to baselined items, matching contracts that demand formatted deliverables.
Cradle plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Cradle RM Desktop and RM Pro | Not published | Requirements management editions; the page shows no prices and links to purchase pages. Trial is offered by download. |
| Cradle SE Desktop and SE Pro | Not published | Systems engineering editions with model-based systems engineering support. The page lists no prices for these editions. |
| Cradle Enterprise | Not published | Enterprise edition; details sit behind the purchase link and are not shown on the homepage. |
| Cradle SaaS subscription | Not published | Subscription through the Cradle SaaS platform; SaaS services such as development, engineering and training are sold separately. |
Checked November 2026.
What Cradle does
- Document Loader
- Imports requirements from external documents and detects differences when a document is revised, reducing manual comparison when a customer reissues a specification. Teams can compare revisions without reading both documents line by line.
- Concurrent editing by locking
- Individual locking lets several users edit requirements concurrently without overwriting each other's work. Individual locking lets several users edit requirements concurrently without overwriting each other's work or waiting for one person to finish.
- MBSE notations
- Supports over 20 diagram notations for model-based systems engineering, including SysML, UML and IDEF. Modeling notations sit beside the requirements, so a team need not keep a separate modeling tool in sync with its specification.
- Configuration management
- Built-in baselines, audit trails and suspect-marking of related items show what to recheck when something changes. That helps engineers see what to recheck after a change.
- Risk register and test execution
- A risk register with risk matrices and test execution with step-by-step prompts put verification and risk records beside requirements. Verification and risk records stay beside requirements, which helps programs with formal reporting duties.
How Cradle handles your data
The privacy policy page returned 404 when opened, so the vendor's policy was not checked for model training, retention or hosting region. The homepage references a Cradle SaaS platform without naming a region. It says Cradle supports an organization's information security management system but does not claim certification for the product itself. No AI feature is named, which makes training use less of a live question, but the page does not address it. Desktop and enterprise editions let teams keep data on infrastructure they control.
Where Cradle falls short in practice
- No AI described. The homepage names no AI feature, so wording checks or generation are not part of what the page offers. Teams expecting wording checks or generation will find nothing described on the page.
- No published prices. Every edition and SaaS tier needs a purchase page or a contact, and the trial length is not stated on the homepage. Buyers must contact the vendor even for a rough budget.
- Office links via plug-ins. Office and Excel connections work through plug-ins or direct interfaces rather than a named native connector, which may need setup work. Plan setup time when the workflow depends on Word or Excel.
- Heavier than a requirements editor. With modeling, risk, test and publishing included, a team wanting simple requirement lists will use only a fraction of it. That breadth means a lot of unused capability for a plain requirement list.
Works with
Alternatives to Cradle
Cradle: common questions
What editions of Cradle exist?
The homepage lists RM Desktop and RM Pro for requirements management, SE Desktop and SE Pro for systems engineering with model-based support, an Enterprise edition, and a SaaS subscription. SaaS services such as development, engineering and training are sold separately. No prices appear on the page.
Does Cradle have a free trial?
The homepage offers a free trial through a download link. Its length is not stated on the page, and no free plan is described. Ask the vendor how long the trial runs and whether it covers RM only or also the systems engineering editions.
Which modeling notations does Cradle support?
The page says Cradle supports over 20 diagram notations for model-based systems engineering, naming SysML, UML and IDEF among them. That makes it a fit for teams who want requirements and models linked, rather than a requirements list with a separate modeling tool.
Does Cradle use AI?
No AI feature is mentioned on the pages checked. The product's described strengths are the Document Loader, baselines with suspect-marking, document publishing, a risk register and test execution. Buyers who need AI drafting should check other tools in this category or ask 3SL directly.
Can Cradle connect with Word, Excel and directories?
The page lists Microsoft Word, Excel, LDAP, Active Directory, ReqIF, CSV and XML. Office and Excel links work through plug-ins or direct interfaces rather than a named native connector, so test the exact workflow you need during the trial. The page does not say which Office versions the plug-ins support.