Rowslint alternative with your columns in code, not on a server
Updog's columns are props in your own code, and the importer ships inside your bundle. Nothing is fetched before it renders, so it works offline and behind a firewall.
100% client-sideWhite-labelSchema in code
Updog and Rowslint at a glance
| Dimension | Updog | Rowslint |
|---|---|---|
| Data privacy | Files are parsed, validated, and edited in the browser. Row data never reaches Updog's servers, so there is no data processor, DPA, or residency to manage. | Files are parsed and validated in the browser, and the widget has no endpoint that could receive rows. Finished rows post from the browser to the destination URL set on your template, or come back through a callback. Rowslint is still called at runtime, for the template and for per-column pass and fail counts. Its terms and privacy policy, both dated April 2024, cover telemetry only and say nothing about imported files. Enterprise offers self-hosting, with no setup documentation found. |
| White-label | Full styling through CSS variables and class overrides. No Updog logos or "powered by" on any plan, including the free one. | Theming through a small set of CSS variables for the dialog and its buttons, plus a stylesheet served from Rowslint's API. The homepage says fully white-label, though a "Powered by Rowslint" label ships in the widget text. The Max plan at $85 a month lists Custom branding. |
| Pricing | Free for development, and a 14-day trial with no card when you go live. In production, a flat $19 per domain per month, the same at any volume, and your first paid domain includes a free one for staging. | Public on the homepage, metered by uploaded file. Free is $0 for 100 file imports a month, Pro $45 for 10,000, and Max $85 for 50,000, with two months free on annual billing and a 14-day trial without a card. Enterprise is quoted. |
| Data mapping | Schema in code. Fuzzy column matching with a built-in synonym dictionary you can extend, or connect the AI your organization already approves through a hook, so it runs on infrastructure you control with no new AI vendor to clear. Updog keeps no mapping history. Your app owns that state and can supply saved selections on later imports. Maps incoming values to your options. Auto-detects number and date formats. Combines files by upserting on a key. | Columns live in a template on Rowslint's servers, authored in its dashboard and fetched with your API key before the widget renders. Each column can carry a list of alternative header names, and the rest are matched to the closest column name by edit distance, then confirmed by the user. AI column matching is the headline Pro feature, though no model call was found in the shipped widget. No value-level mapping or stored mapping history was found. |
| Data cleaning | Cells edit inline through a typed editor per column, text, number, date, select, or multi-select, with clipboard, fill handle, and full undo and redo. Values pass a transform on the way in, then validation runs at three levels, built-in rules, your own checks, and asynchronous ones. Sorting, full-text search, filters on the columns you enable, and formulas. Invalid rows can block submit or come through flagged. Any view also exports in any supported format. | A validation table where users see flagged cells, filter to rows with errors, and hide columns. Rules are set per column in the template and run in the browser, covering types, email, phone by country, choice lists, regex, and date format, and your code can override a column's rule with your own function. Invalid rows can be let through if the template allows it. |
| Scale & performance | About one million rows at around 20 columns in the browser, with a filter on every column. No fixed row cap, the browser tab's memory is the ceiling, and fewer columns reach further. Filtering and sorting run in a worker, measured at 30 to 250 milliseconds over a million rows. | Runs in the browser, parsing on the main thread with no web worker in the bundle, and no row limit or file-size limit is published. An engineering post describes chunked parsing in a worker and 2GB streaming, which the shipped widget does not do. Plans cap how many files you import a month. |
| Integration | React component, plus a Web Component for Vue, Angular, Svelte, and vanilla JS. Renders inline in your page's DOM. Imports CSV, TSV, Excel, JSON, and XML, plus any other format through a parser you register yourself. | A loader package pulls the widget from a public CDN at its newest version and opens it as a modal over your page, a custom element and not an iframe. The homepage markets React, Vue 3, Svelte, and Solid SDKs; npm carries the vanilla JavaScript package and an Angular one from 2024. Reads .xlsx and .csv, while the pricing page lists CSV, XLSX, XLS, and TSV. |
| Languages & RTL | English by default, with every interface string overridable, so you can localize into any language. Right-to-left is first-class. It flips layout, text alignment, scrollbars, and column pinning, and carries through to export. | Two interface languages, English and French, set with a language option. The site mentions i18n bundles and overridable labels, which the docs do not cover. No right-to-left support was found. |
| Accessibility | An ARIA grid with full keyboard navigation and screen-reader support. WCAG 2.2 AA is the level Updog builds to, with automated rule checks over every component and every step of the importer on each test run. Updog holds no independent audit or VPAT. | Dialogs and form controls carry roles and labels from the component library underneath, and the validation table has no grid semantics. No accessibility statement was found. |
Some of what Rowslint's site describes was not found in the shipped package, so this page follows the package and the docs. Both npm packages are published without a license. Facts checked against Rowslint's public pages in August 2026.
Which one fits your team
Rowslint may fit better if
- You want a free tier you can run in production, at up to 100 file imports a month.
- You want people outside engineering to change the columns and the validation rules in a dashboard, with no deploy.
- You want the finished rows posted to your endpoint, with your own headers, without writing that call yourself.
- You want a hosted upload page your users can open by link, rather than an importer embedded in your app.
Updog may fit better if
- You want an importer and spreadsheet editor embedded in your own app.
- You want to match your app's design exactly, styling the editor with your own CSS through variables and class overrides.
- You want to handle large files in the browser, with nothing stored on a server.
- You want flat, public pricing with no per-import fees.
- You want to use the AI your organization already approves, with no new vendor to clear.
Questions people ask
Is Updog a drop-in replacement for Rowslint?
No. Both embed a client-side import flow, but Updog's columns are props in your code rather than a template you author in a dashboard, and its flow continues into a full spreadsheet editor.
How do the two handle data privacy?
Neither sends row data to a vendor. Both parse and validate in the browser, and Rowslint posts the finished rows from the browser to a URL you set. Rowslint does call its own API to fetch the template before the importer can render.
How does Updog pricing compare?
Updog is a flat $19 per production domain per month, free in development. Rowslint has a free tier of 100 file imports a month, then $45 for 10,000 and $85 for 50,000.
Can Updog handle large files like Rowslint?
Yes, about 1 million rows in the browser, bound by the machine's memory. Rowslint publishes no row or file-size limit, and its widget parses on the main thread with no web worker.
Does either one need the vendor to be online?
Updog does not. It installs from npm and runs from your own bundle, with the columns in your code. Rowslint's widget loads from a public CDN and fetches your template from its API before it can render.
How does column matching compare?
Both suggest matches before the user confirms. Updog uses fuzzy matching with a synonym dictionary you can extend, and can call an AI endpoint you control. Rowslint matches on a per-column list of alternative header names, then on the closest name by edit distance. Its Pro plan markets AI matching, which the shipped widget does not perform.
Can Updog be used to view or edit existing data, without an import?
Yes. Load existing data straight into Updog's editor to view and edit it, with a read-only mode. Rowslint's validation table only appears during an import.
How do the two handle accessibility?
Updog's grid uses ARIA semantics with full keyboard navigation and screen-reader support, and the importer is checked against WCAG 2.2 A and AA rules on each test run. Updog holds no independent audit or VPAT. Rowslint's dialogs and form controls carry roles and labels from the component library underneath, its validation table has no grid semantics, and no accessibility statement was found.
Can the interface be translated, and does right-to-left work?
Updog ships in English with every interface string overridable, so you can localize into any language, and it renders right-to-left layouts natively. Rowslint documents two interface languages, English and French. Its site mentions i18n bundles and overridable labels, which the docs do not cover, and no right-to-left support was found.
See how Updog compares to other CSV importers
Try Updog for free
Install the package, add your columns, render the component. Free on localhost and preview domains. Every feature included.