A SwissADME alternative with more in the box
SwissADME is a great free tool — we built OCSR.ai because we wanted everything it does plus image-to-structure search, mutagenicity, per-site pKa, similarity search, and a one-click PDF report. All free, no login.
What SwissADME does well
SwissADME (developed at the SIB Swiss Institute of Bioinformatics) is widely used and cited for good reason: it gives clean drug-likeness summaries (Lipinski, Veber, Egan, Muegge, Ghose), GI absorption and BBB-penetration radar plots, P-gp and CYP inhibitor predictions, and lead-likeness flags. For a quick triage of one compound, it's a solid choice. We're not here to bash it.
The gaps we kept hitting in our own work were the reason OCSR.ai exists.
Where OCSR.ai goes further
Image-to-structure as the entry point
SwissADME starts with a SMILES. Most of the time the structure we're curious about lives in a PDF figure or on a slide. OCSR.ai accepts a pasted or dropped image directly — our recognition engine hits 93.2% on handwritten structures and even higher on print. See chemical image search.
Mutagenicity (AMES)
SwissADME doesn't predict AMES mutagenicity. OCSR.ai does, alongside hERG, hepatotoxicity, and skin sensitization, on the same compound page. No tab-hopping to ProTox or admetSAR.
Per-site pKa
Most free ADMET tools give you one global pKa or none. OCSR.ai gives per-site predictions with acid/base classification — useful for formulation, salt-form selection, and rationalizing solubility data.
Database search over 1.3 trillion molecules
SwissADME has no built-in molecular database. OCSR.ai is a Chemical Intelligence Engine first — every compound is searchable by SMILES, InChIKey, IUPAC name, molecular formula, or CAS number, with sub-second response.
Tanimoto similarity search
Find structurally related compounds using Morgan fingerprints. Useful for lead hopping, finding analogs of a hit, and discovering related literature.
One-click PDF report
Structure, identifiers, ADMET, toxicity, pKa, references — all bundled into a print-ready PDF. Drop it into a regulatory submission, a thesis, or an internal review without reformatting.
Per-compound AI chat (Darvi)
Every compound page has a chat assistant with full context on the molecule. Useful for sanity-checking interpretation of predictions or finding related literature without leaving the page.
Side-by-side comparison
| Feature | OCSR.ai | SwissADME |
|---|---|---|
| Price | Free | Free |
| Login required | No | No |
| Paste image → search | ✓ Yes | SMILES only |
| Lipinski / Veber / Egan / Muegge / Ghose | ✓ | ✓ |
| GI absorption / BBB | ✓ | ✓ |
| P-gp / CYP inhibition | ✓ | ✓ |
| AMES mutagenicity | ✓ | — |
| hERG cardiotoxicity | ✓ | — |
| Hepatotoxicity | ✓ | — |
| Per-site pKa | ✓ | — |
| Molecular database search | 1.3T mol | — |
| Tanimoto similarity | ✓ | — |
| PDF report export | One-click | Manual screenshot |
| Per-compound chat assistant | ✓ Darvi | — |
When to still use SwissADME
Being honest: SwissADME has been peer-reviewed and cited in thousands of papers, and its drug-likeness logic is well-documented. For a small triage on a single compound with no need for image search, mutagenicity, or downstream similarity work, it does the job. We're built for the cases where you want more in one place — and where you started from an image or a name rather than a typed SMILES.
Try OCSR.ai on a compound you already know
The fastest way to evaluate this is to open a known compound and look at every tab:
- Aspirin — the classic small molecule. Great for benchmarking against SwissADME's output.
- Atorvastatin — larger, more complex; see how ADMET handles drug-like complexity.
- Imatinib — a tyrosine-kinase inhibitor. Check the CYP3A4 substrate flag and the BBB call.
- Metformin — small, highly polar. A good test for absorption-prediction limits.
Open OCSR.ai and try it
Paste a SMILES, drop an image, or type a name. ADMET, toxicity, mutagenicity, pKa and a PDF report are one click away. No login.
Open OCSR.ai →