A Free SnapGene & Benchling Alternative in Your Browser
SeqBench is a web workbench for editing plasmids and running everyday molecular-biology analysis, with nothing to install. Its SeqStudio editor opens and exports SnapGene .dna files, remaps features live as you edit, simulates Gibson / Golden Gate / restriction / TOPO-TA / Gateway cloning, reads Sanger .ab1 traces, and is backed by 58 DNA, RNA and protein tools.
It isn't a full R&D platform — no lab notebook, sample registry or team workspaces — but for the design-and-analysis work itself it's a genuine replacement.
SeqBench vs SnapGene vs Benchling
| Aspect | SeqBench | SnapGene | Benchling |
|---|---|---|---|
| Access model | Web app — nothing to install | Licensed desktop app | Cloud R&D workspace |
| Price | Free | Paid license | Paid (free academic tier) |
| Editable plasmid workbench | Yes — SeqStudio, live feature remapping + undo/redo | Yes | Yes |
| SnapGene .dna files | Read & write (import + Export .dna) | Native | Import only |
| GenBank import / export | Yes | Yes | Yes |
| Restriction analysis + virtual gel | Yes | Yes | Yes |
| Translation / ORFs / primer design | Yes | Yes | Yes |
| Cloning simulation | Gibson, Golden Gate (+ junction fidelity), restriction/ligation, TOPO/TA, Gateway | Yes | Yes |
| Sanger trace (.ab1) viewer | Yes — built-in chromatogram viewer | Yes | Limited |
| Construct history / provenance | Yes — clone/mutation steps logged | Yes | Yes |
| REST API + MCP for automation & AI agents | Yes | No | API (paid) |
| Where your data lives | Workbench edits stay in your browser; API calls run in memory, never stored | On your computer | In the cloud |
| Electronic lab notebook / sample registry | No | Limited | Yes |
Comparison is simplified and provided in good faith — check each vendor for current pricing and features. SnapGene and Benchling are trademarks of their respective owners and are not affiliated with SeqBench.
What SeqBench is great for
- Editing plasmids and opening/exporting SnapGene .dna files in the browser
- Simulating cloning and checking primers straight from the browser
- Reading Sanger .ab1 traces and reference checks
- Students, core facilities, and automation via REST / MCP
What it doesn't replace
- An electronic lab notebook and sample / inventory registry
- Team collaboration, permissions and shared workspaces
- An offline desktop app and curated parts libraries
- Full R&D-platform record-keeping and compliance
The workbench and tools that overlap with SnapGene
Type or paste a sequence and edit it directly — every feature remaps live as you insert, delete, or replace bases, with undo/redo and GenBank import/export.
Render a circular or linear map with restriction sites.
Find recognition and cut sites for common restriction enzymes.
Assemble fragments and design junction primers for Gibson, Golden Gate or restriction cloning.
View an .ab1 / .abi Sanger chromatogram, read the base calls and export the trace.
Translate a nucleotide sequence to protein in any or all six reading frames.
Find open reading frames in all six frames and translate them.
Estimate primer Tm, GC% and molecular weight from a sequence.
Frequently asked questions
Is SeqBench a free alternative to SnapGene?
Yes. SeqBench's SeqStudio workbench is a free, browser-based editable plasmid and sequence editor that covers the everyday SnapGene workflow: an editable map with live feature remapping and undo/redo, restriction-site scans with a virtual gel, translation, ORF finding, primer design, and cloning simulation (Gibson, Golden Gate with junction fidelity, restriction/ligation, TOPO/TA and Gateway). It also reads and writes SnapGene's .dna format, so you can move files both ways. It doesn't ship the full desktop suite's parts library or offline app, but for most day-to-day cloning and analysis it's a genuine replacement.
Can SeqBench open and export SnapGene .dna files?
Both. SeqStudio imports .dna files (via a reverse-engineered parser, since SnapGene has never published a spec) and can Export .dna, alongside GenBank import/export — so you can open a colleague's SnapGene file in the browser, edit it, and hand back either format. GenBank round-trips fully, including features that wrap a circular plasmid's origin.
How is SeqBench different from Benchling?
Benchling is a cloud R&D platform built around an electronic lab notebook, a sample/inventory registry and team collaboration, on a paid plan. SeqBench is a focused workbench for the design-and-analysis work itself — editing plasmids, simulating cloning, checking primers and reading traces — without the notebook, registry or account overhead. Many teams use SeqBench for quick design work and Benchling for record-keeping.
Do I have to upload my sequence?
The SeqStudio workbench — editing, undo/redo, live auto-annotation, restriction digests, the virtual gel, and .dna/GenBank import/export — runs entirely in your browser and never sends your sequence anywhere. Some standalone calculators send your pasted sequence to the SeqBench API, where it's processed in memory and never stored, and database lookups send only the public accession needed to fetch the record.
Can I automate SeqBench or use it with AI agents?
Yes. Nearly every calculation is exposed through a REST API and an MCP (Model Context Protocol) server, so tools like Claude can drive restriction analysis, primer design, translation, cloning checks and more directly. This is something desktop SnapGene doesn't offer.
What does SeqBench not replace?
It isn't a full R&D platform: there's no electronic lab notebook, no sample/inventory registry, and no team permissions or shared workspaces. It also doesn't have the offline desktop app or the curated parts/enzyme libraries of a paid suite. If those workflows are core to your team, you'll want a full suite alongside it — but for editing plasmids, simulating cloning, designing primers and reading traces, SeqBench covers the daily work on its own.