AI-Powered PCR Primer Design Tool
What is this tool?
This AI-powered primer design tool runs a 24-step validation pipeline including Primer3 design, BLAST specificity checking, SNP screening, repeat masking, TaqMan probe design, and multiplex scoring. It is designed for molecular biology researchers who need validated, audit-ready primer pairs.
Design validated primer pairs and TaqMan probes in under 30 seconds. VigyanLLM Primer runs a 24-step validation pipeline — thermodynamics, BLAST specificity, SNP screening, repeat masking, and multiplex scoring — and produces lab-ready results with no external API calls.
Try VigyanLLM Primer Free →Free for PhD researchers. No credit card required.
Last updated: July 2026 · Reviewed by VigyanLLM Research Team
VigyanLLM is an autonomous primer design tool that utilizes LLM algorithms to replace manual iterative primer analysis. Unlike basic web tools, it evaluates forward and reverse primers simultaneously for qPCR, PCR, and CRISPR applications.
| Input | Output |
|---|---|
| DNA sequence (FASTA) + target parameters | Forward & reverse primers with Nearest-Neighbor Tm calculations |
| GC content range (default 40-60%) | Primer GC content optimized to prevent secondary structures |
| Primer pair sequences for validation | Dimer ΔG scores for 3' end complementarity (self & cross-dimer) |
| Genome selection (human, mouse, rat, custom) | BLAST specificity report with off-target mismatch positions |
| Multi-target sequences (for multiplex) | Multiplex-compatible primer sets with cross-reactivity matrix |
24-step Primer Design Validation Pipeline
Thermodynamic Profiling
SantaLucia 1998 nearest-neighbour thermodynamics for accurate Tm, delta-G, and hairpin/dimer predictions. Supports monovalent and divalent cation corrections.
- Primer melting temperature (Tm)
- Hairpin and self-dimer checks
- Cross-dimer (heterodimer) analysis
- Delta-G threshold filtering
BLAST Specificity
Primer-BLAST against nr, refseq_rna, refseq_genomic, and custom databases. Excludes non-target organisms with configurable taxonomy filters.
- NCBI BLAST+ integration
- Taxonomic filter (human, mouse, rat, virus)
- Off-target mismatch threshold
- 3' end specificity check
SNP & Repeat Screening
Filters primers overlapping known SNPs (dbSNP, COSMIC) and repetitive elements (RepeatMasker, simple repeats, low complexity regions).
- dbSNP overlap detection
- COSMIC mutation screening
- RepeatMasker annotation
- Simple repeat and homopolymer filters
TaqMan Probe Design
Dual-labelled hydrolysis probe design with Tm differential optimisation, GC content balancing, and dye-quencher compatibility validation.
- Probe Tm 5-10°C above primer Tm
- FAM, VIC, HEX, ROX, Cy5 dye support
- BHQ and MGB quencher options
- Probe secondary structure check
Multiplex PCR Design
Design primers for 2-plex to 6-plex assays with amplicon size differentiation, Tm harmonisation, and cross-reactivity elimination.
- Amplicon sizing (60-500 bp)
- Tm harmonisation (±1°C)
- Cross-dimer matrix analysis
- Primer concentration balancing
Audit-Ready Reports
Download complete design reports with full validation metrics, primer sequences, primer locations, and QC scores. Multiple export formats.
- PDF audit report
- CSV/JSON data export
- IDT and Twist order-ready formats
- Primer location maps
Design Your First Primer Pair
Enter a gene target or NCBI accession. VigyanLLM runs the full 24-step validation pipeline and outputs a ready-to-order primer pair.
Open VigyanLLM Primer →Frequently Asked Questions About Primer Design Tool
Everything you need to know about using this tool
Is the Primer Design tool free?
The primer design tool offers 5 free designs per user. Each design uses the VigyanInferenceEngine for AI-powered primer optimization, which requires backend compute resources. After 5 free uses, a subscription is required.
What makes VigyanLLM primer design different?
VigyanLLM uses proprietary AI models trained on validated primer datasets, not just Primer3. It optimizes for Tm, GC content, specificity, secondary structure, and amplicon size simultaneously.
What types of primers can I design?
You can design standard PCR primers, qPCR primers, sequencing primers, multiplex primers, degenerate primers, bisulfite PCR primers, and allele-specific primers.
How does specificity checking work?
Designed primers are automatically BLASTed against NCBI databases to verify target-specific amplification and detect potential off-target binding.
Do I need an account?
No, you can use primer design without an account for your first 5 designs. Creating an account unlocks usage tracking and subscription management.
What happens after 5 free uses?
You can subscribe to continue using the tool. Subscriptions start at ₹99/day for the Daily Pass (5 primer designs + 2 docking runs) with monthly plans from ₹2,499/month.