Comparison
ManyRows vs Arena PLM
Arena is a good PLM for the product it was built around: electronics and medical devices. ManyRows is the one to look at when your product is a garment, a formula, or several different things at once — and when you would rather shape the system than fit into it. That is not a custom-fields box: underneath is a typed data platform where base types group your types, one field serves several of them at once, and the link between two records is a record in its own right.
What it is shaped for
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Electronics and medical devices Arena grew up around circuit boards and regulated devices, and it is very good at them. If that is your product, take it seriously. | Works | Purpose-built |
| Apparel, footwear and soft goods Size specs with grading and tolerances, per-season time and action calendars, colourways, factories and mills. | Purpose-built | Not its focus |
| Food, cosmetics and other formulations Percentage recipes, co-products and by-products, yield and absolute yield, and quantities that are fixed per batch rather than per unit. | Purpose-built | Not its focus |
| A mixed portfolio in one system Hardware, garments and formulations are just different types you define. They share fields, filters and reporting instead of needing separate tools. | Yes | One model |
| Define your own types and fields A lot, a sample, a piece of equipment, a test rig — same tools as a part. No feature request, no release. | Yes | PLM-shaped schema |
The data model underneath
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Entity types, and base types over them Fabric and Trim are both Materials: a field defined once on the Material base type lands on every member, and a BOM line pointed at Material accepts either one. A type can belong to several base types at once, so Fabric is a Material and a Purchased Item and carries both sets of fields. The grouping applies to anything you define — a lot, a sample, a test rig — not only to parts. | Both, in a form | Item categories |
| One field, reused across types, tuned per type Country of Origin is a single field attached to Fabric and to Trim — mandatory on one, optional on the other, with different defaults. It stays one field, so filters, facets and CSV columns line up across types instead of being five look-alike attributes that never quite match. | Yes | Category attributes |
| Derived fields that follow a reference A lookup pulls the supplier's country onto every part that references it. A reverse field shows a supplier every part pointing at it, with nobody maintaining the other side of the link. | Reverse and lookup | Not its focus |
| Relationships that carry their own data A relationship type is backed by an entity type of its own, so the link between two records holds fields — dates, roles, quantities, notes. Cardinality is declared, and a self-referencing relationship rejects cycles rather than letting a tree close on itself. | The link is a record | Item relationships |
| The BOM line is a record you design The junction is a real type, so a line carries whatever the work needs and orders itself by an item-sequence field if you want the 10, 20, 30 convention. An optional role field turns a structure into a formula — primary, co-product, by-product, ingredient — with yield per line and absolute yield derived from it. | Yes | Line attributes |
| Rollups past cost and mass Total for mass, longest chain for lead time, earliest date for “what is the soonest expiry anywhere in this build”, and worst case over a flag for “is this whole assembly compliant”. Arena rolls compliance up a BOM too, and does it well; the difference is that here the same engine points at any flag or date field you define. A component with no value is reported as a gap rather than counted as a pass. | Four modes | Compliance rollup |
| Effectivity on two axes at once A record can be valid between two dates and between two build numbers independently, and the structure lens applies both together — so “what was in build 400” is a question the BOM can answer, not only “what changed when”. | Dates and unit numbers | Change effectivity |
| Someone to build the model with you Send a spreadsheet, a spec or an export from whatever you run today and we will turn it into types, fields, base types and BOMs with you. It costs nothing because it is the fastest way for us to find out what the product is missing. It comes with Pro and above, and within reason means a first pass and teaching you to run it, rather than becoming your data team. | Free on Pro and above | Onboarding services |
Product structure
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Multi-level BOM | Yes | Yes |
| Where-used, multi-level | Yes | Yes |
| Approved alternates per line | Yes | Yes |
| Formulas with co-products and by-products Primary, co-product, by-product and ingredient roles, with yield per line and absolute yield derived from it. | Yes | Not its focus |
| Fixed vs variable line quantities A catalyst or a setup charge is needed once per batch, not once per unit, and the requirements explosion knows the difference. | Yes | Not its focus |
| Several BOM planes per product A materials BOM and an operations sheet on the same item, authored separately. | Yes | One structure |
| Import a BOM from a CAD or spreadsheet export Drop in the indented CSV your tool exports. Parts match on part number, so re-importing after a design change updates the tree instead of duplicating it. | Built in | Built in |
Change control
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Change requests with a working copy Edit a copy, compare it side by side with what is live, approve it and the whole change applies at once. | Yes | Yes |
| Approver rosters, stages and quorum | Yes | Yes |
| Delegation and departed-approver handover An absence does not jam a change request, and someone leaving does not strand one. | Yes | Yes |
| Immutable revisions with the sign-off manifest | Yes | Yes |
| Several change requests released as one decision Re-spec the part and relabel everything that uses it, approved separately, released together in one transaction. | Yes | Yes |
Quality, compliance and cost
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Regulated quality processes (FDA, ISO 13485) Arena's quality and training records are built for audited device work. ManyRows records tests, dispositions and approvals, but makes no regulatory claim. | Not certified | Purpose-built |
| Supplier and manufacturer part data (AML/AVL) ManyRows has vendor prices with quantity breaks and validity windows, and approved alternates per line. Arena's supplier item depth is deeper out of the box. | Modelled yourself | Purpose-built |
| Test rounds with verdicts and dispositions Use as is, rework or scrap, with a concession expiry and an owner and due date for the follow-up. | Yes | Yes |
| Measured values against a spec Every value keeps the limits it was judged against, so tightening a spec later never rewrites last quarter's results. | Yes | Yes |
| Costed BOM with wastage and landed cost Rolled cost, extra cost lines, mixed currencies converted at read, and labelled cost snapshots. | Yes | Add-on |
| Lot genealogy and recall trace | Yes | Not its focus |
| Product content out to sales channels Channels, listings and per-channel pricing are being built onto the same record that carries the BOM and its change history — one product record rather than a PLM and a separate catalogue kept in step by hand. | Native, in build | Not its focus |
Cost and control
| Capability | ManyRows | Arena PLM |
|---|---|---|
| Price you can work out yourself Plans, seats and limits are published. You can decide whether it fits your budget before speaking to anyone. | Listed on the site | Quoted per seat |
| Self-serve signup | Yes | Through sales |
| Free trial Sign up and be inside the product in a minute, without a call first. Paid plans start after the trial, and every price is listed. | 7 days, no card | Trial via sales |
| Export the whole project and re-import it Schema, records, BOMs, specs, quality history and calendars, as a bundle you can move between projects. | One request | Export tooling |
| Full REST API on every record Not only the record: its revision history, the spec it's judged against, its quality record, its schedule and its material requirements are all readable by an integration. | Included | Included |
| Outbound webhooks when something changes Register a URL and we POST to it the moment a record changes or a governed change is approved — HMAC-signed so you can prove it came from us, retried with backoff if you're down, and every attempt visible in the app. You set it up yourself; there's no middleware in between. | Built in, signed | Via API |
| Custom development when something is genuinely missing Ask before you assume it is a no. When the gap is something ManyRows should have anyway — a field type, an import format, a calculation, an export — we build it and ship it to everyone, at no charge. It is included from the Pro plan up, and within reason means it has to belong in the product for other customers too. At Arena's size your request is weighed against a roadmap serving thousands of electronics and device teams; at ours, a garment or formulation gap is the kind of thing we want to build. | Free on Pro and above | Roadmap request |
When Arena is the right answer
If you build electronics or medical devices and need audited quality processes, training records and deep approved-manufacturer data out of the box, Arena is purpose-built for exactly that and worth what it costs. ManyRows is the better fit when your product is not a circuit board — or when you need one system to hold several kinds of product without pretending they are all the same shape.
Questions
- How is ManyRows different from Arena PLM?
- Arena is built around electronics and medical devices, and it is strong there — particularly for regulated quality processes and supplier part data. ManyRows is a typed platform you shape yourself, so it fits products Arena was not designed around: garments with size specs and seasonal calendars, formulations with co-products and yield, or a portfolio holding several of those at once.
- Should I choose Arena instead?
- If you build circuit boards or regulated medical devices, and you need FDA or ISO 13485 quality processes and deep approved-manufacturer data out of the box, Arena is the better fit and worth the money. ManyRows makes no regulatory certification claim.
- How capable is the underlying data model?
- The PLM is an application built on a general typed content platform, which is why it bends to your product rather than the other way round. Entity types are the concrete things you track — Fabric, Trim, Ingredient, Lot, Sample. Base types group them, so one field definition serves several types and a reference can be pointed at the base type to accept any member. Fields are reused across types with per-type overrides, so the same Country of Origin can be mandatory in one place and optional in another and still filter as one column. Links between records are records themselves, so a relationship carries its own fields. A BOM line is a type you design, and a role field turns a structure into a formula. Rollups run in four modes, including earliest-date and worst-case-over-a-flag, so “what expires soonest anywhere in this build” and “is this whole assembly compliant” are configuration rather than custom code. And if the modelling is the daunting part, we will do the first pass with you — send a spreadsheet or an export from whatever you run today and we will turn it into types, fields and BOMs — included from Pro up, within reason.
- Can ManyRows handle recipes and formulations?
- Yes. Formulas carry primary, co-product and by-product outputs alongside ingredients, with yield and absolute yield per line, and quantities that can be fixed per batch rather than scaling per unit — so a catalyst is not overstated when the batch grows.
- What if ManyRows does not do something we need?
- Ask us — we do custom development for free on the Pro plan and above, within reason. If the gap is something ManyRows should have anyway, we build it and ship it to every customer rather than leaving it in a private branch for you. That is exactly why it costs nothing: your gap makes the product better. It is also the limit — we will not build a one-off that only you would ever use, and we will not promise a date we cannot hold. If the answer is no you get it in a sentence, not a services quote.
- What does ManyRows cost?
- Pricing is published on the site — plans, seats and limits — with a 7-day free trial that needs no card, so you can work out the cost before speaking to anyone.
- How does this connect to our ERP?
- Two ways, and you can use both. Pull: a REST API over records, BOMs, revisions, quality records, specs and schedules, authenticated with a project API key. Push: outbound webhooks, so your ERP hears about a change when it happens instead of polling for it — signed, retried, and with a delivery log you can check. Neither needs an integration platform in between.