Last Updated: May 2, 2026 | Focus: choosing the right workflow before opening a calculator or checklist
Oligo Design Workflow Selector
Use this page as a router for three common oligo jobs: validate PCR primers before ordering, QC a large oligo pool before synthesis, or size and screen a CRISPR sgRNA library. Pick the workflow first, then open the dedicated checklist or calculator only when that task is the next action.
Key Takeaways
- Yes3 task-led workflows covering primer checks, pool QC, and CRISPR library preparation
- YesEach workflow starts with the decision page you should open, not a generic overview
- YesClear routing for Tm, GC%, dropout risk, and guide-count planning
- YesTool combinations are mapped after the experiment decision is clear
- YesDifficulty labels help you choose between quick validation and full library workflows
- YesTime estimates tell you whether a job is a 15-minute primer check or a full pre-order review
Pick the Workflow Before the Tool
| Workflow | Open First | Decision Signals | When to Open a Tool |
|---|---|---|---|
| Validate PCR Primers | PCR primer validation workflow | ready to order, optimize, or redesign | Open Tm Calculator only for the Tm step |
| QC a Large Oligo Pool | Oligo pool QC workflow | batch passes, needs filtering, or needs vendor review | Open Batch QC for sequence upload |
| Design a CRISPR sgRNA Library | CRISPR sgRNA library workflow | enough guides, clean sequences, and synthesis-ready pool | Open Coverage Calculator for library sizing |
Use the tool directory after this page has narrowed the job, or explore step-by-step tutorials for each tool.
Oligonucleotide Synthesis Platform Comparison
Technical specifications from major synthesis platforms (2024 vendor data). Choose based on pool size, length requirements, and budget constraints.
| Technology | Error Rate | Length Range | Pool Size | Turnaround |
|---|---|---|---|---|
| Array-Based (Twist, Agilent, CustomArray) | 1/300-1/500 (premium QC) | 60-230 nt optimal: 150-200 nt | 10⁴-10⁶ high-throughput | 2-3 weeks |
| Column Synthesis (IDT, Sigma, Eurofins) | 1/1000-1/2000 (HPLC purified) | 15-100 nt standard PCR primers | 1-10³ low-medium scale | 2-5 days |
| Enzymatic (Molecular Assemblies, DNA Script) | 1/200-1/400 (length-dependent) | 50-300 nt emerging: up to 1000 nt | 10²-10⁴ medium-scale | 1-2 weeks |
Note: Error rates vary by sequence composition (GC-rich sequences typically show higher error rates). Use the dedicated oligo-pool and vendor-comparison pages before relying on any platform-specific assumption for a live order decision.
Validate PCR Primers Before Ordering
Decide whether a primer pair is ready to order, needs optimization, or should be redesigned.
Tools Used:
QC a Large Oligo Pool Before Ordering
Full workflow: run batch sequence QC, estimate synthesis risk, and review pool uniformity before vendor submission.
Tools Used:
Design and QC a CRISPR sgRNA Library
Size your library, screen guides for GC and sequence issues, and prepare a cleaner oligo-pool submission.
Tools Used:
How This Selector Routes the Work
Oligonucleotide projects usually fail at the handoff between tasks, not because one calculator is missing. This selector separates the job into workflow pages first, then sends you to a dedicated tool only when the next action is calculation, sequence QC, structure review, or library sizing.
If the task is a primer pair, open the PCR primer workflow before calculating. If the task is a pooled order, open the oligo pool QC workflow before comparing vendors or error rates. If the task is a CRISPR screen, open the library workflow before sizing coverage or screening guides.
Why the Hub Stays Short
The detailed thresholds, formulas, and troubleshooting notes live on the dedicated workflow or tool pages. Keeping this hub short helps each page do one job: the hub chooses the route, the workflow explains the decision, and the tool performs the calculation.
This also keeps search intent clean. Users looking for a calculator should land on the calculator. Users comparing oligo pool ordering risk should land on the pool pages. Users who are still choosing the right experimental workflow can start here and then move downstream.
Choose the Matching Job
Validate PCR Primers Before Ordering (Beginner-Friendly)
Choose this workflow when you already have forward and reverse primer candidates and need a pre-order decision. The page routes Tm calculation, GC review, and structure-risk checks to the dedicated tools in the correct order.
Open this when: the next decision is whether the primer pair is ready to order, needs gradient optimization, or should be redesigned before synthesis.
Next page: PCR Primer Validation Workflow Before Ordering. Open the calculator pages from there when the workflow calls for a specific check.
QC a Large Oligo Pool Before Ordering (Intermediate)
Large oligo pools (10³-10⁶ sequences) require systematic QC: sequence validation (no repeats, length 60-230 nt), Tm uniformity (CV < 10% for hybridization arrays), GC distribution (avoid bias that affects synthesis), and error rate prediction (1/300-1/500 for premium array synthesis per vendor specifications). This pipeline combines Batch Sequence QC (FASTA upload, automated validation), Pool Uniformity Estimator (CV calculation for Tm, GC%), and Error Rate Calculator (composition-based error prediction). Also use Tm Calculator to verify median Tm matches experimental conditions.
QC metrics: (1) Sequence diversity—check for duplicates, excessive homology (>85% identity), homopolymer runs (>6 nt); (2) Tm uniformity—calculate Tm for all sequences, target CV < 10% (strict hybridization) or < 20% (amplification); (3) GC distribution—median 45-55%, avoid extreme outliers (<30% or >70%); (4) Synthesis compatibility—flag sequences with prohibitive motifs (e.g., GGGG runs for some platforms). For NGS library prep, see How to Run Pre-Order Oligo Pool QC.
Workflow (45-90 min): Upload pool sequences to Batch QC, export Tm/GC data, analyze in Uniformity Estimator, estimate error rates per Error Calculator. Filter outliers iteratively until QC thresholds met. Essential for multiplexed assays, variant libraries, and CRISPR libraries.
Design and QC a CRISPR sgRNA Library (Advanced)
CRISPR sgRNA library design (this workflow focuses on SpCas9, the most widely used variant) requires coverage optimization (genome-wide: 3-10 guides/gene, ~50,000-100,000 total; focused: 10-20 guides/target), sequence specificity (minimize off-targets with >2 mismatches), guide activity prediction (GC content 40-60%, avoid TTTT poly-T terminator), and synthesis constraints (20 nt guide for SpCas9; note: SaCas9 uses 21-23 nt, Cas12a uses 23-25 nt). Workflow integrates Coverage Calculator (library size vs. target complexity), Batch Sequence QC (sequence validation, duplicate detection), GC Analyzer (activity prediction), and Secondary Structure Predictor (guide RNA folding).
Design criteria: (1) Coverage—genome-wide screens need 3-10 guides per gene for statistical power; focused libraries can use 10-20 guides for critical targets. Calculate library size requirements in Coverage Calculator. (2) Guide activity—target GC 40-60%, avoid TTTT (Pol III terminator), position guides early in CDS for knockout efficiency. (3) Specificity—check off-target potential using specialized tools; prioritize guides with >3 mismatches to other genomic sites. (4) Synthesis—standard format is 20 nt guide + constant scaffold (~80 nt total); use Oligo Pool QC workflow for final validation.
Workflow (60-120 min): Calculate library size in Coverage Calculator, design guides using external tools (e.g., CRISPRDesign databases), import sequences to Batch QC, filter by GC% in GC Analyzer, check scaffold folding in Structure Predictor. Advanced users should understand statistical power requirements and screening methodology. See Scientific References for CRISPR design publications.
Frequently Asked Questions
What are oligonucleotide use cases?▾
How do I design PCR primers using OligoPool.com tools?▾
What tools are needed for oligo pool quality control?▾
How do I design a CRISPR sgRNA library?▾
Are these use cases suitable for beginners?▾
How do I check for primer dimers and secondary structures?▾
Which oligonucleotide synthesis method should I choose?▾
How were these workflows validated?▾
Where can I find more tutorials?▾
Need the Method Details?
This hub keeps method details out of the first decision step. For citations, formulas, and calculator assumptions, open the relevant workflow page or visit the Scientific References page.
For primer-specific troubleshooting, use the PCR primer workflow. For pool-order decisions, use the oligo pool QC workflow. For CRISPR library sizing, use the CRISPR workflow.
Next Pages to Open
Continue with the workflow page that matches the next decision. Open documentation or references only when you need background.
Open PCR Primer Workflow
Use this when a forward/reverse primer pair needs a ready, optimize, or redesign decision.
Open Oligo Pool QC
Use this when a pooled order needs sequence, uniformity, and synthesis-risk review.
Open CRISPR Library Workflow
Use this when guide count, library coverage, and pool submission readiness are the decision.
Open the Method References
Go here for SantaLucia, Owczarzy, and the primary methods behind the calculators and QC thresholds.
Open the Tutorials
Move to shorter task-led walkthroughs after the workflow has narrowed the job.
Browse All Resources
Return to the full resources hub if you need a wider scan across tutorials, guides, and references.
Start with the Matching Workflow
Start with the workflow that matches your experiment, then open calculators or reference pages only when the workflow tells you which check comes next. Need help with a specific application? Contact us to request a custom use case guide.
Need a Custom Use Case?
Can't find a workflow for your specific application? Let us know what you're working on, and we may create a custom use case guide for you.
Request Use Case