Genderize
Genderize is an API that predicts the gender of a person based on their first name, providing statistical probabilities for male or female classifications.
Verdict
Common use cases
- Personalize email greetings in bulk campaigns
- Audit gender balance in hiring pipelines
- Localize content by regional name patterns
- Enrich CRM records with demographic estimates
- Validate form data for salutation fields
Integration
- Vendor
- Genderize
- Category
- developer-tools
- Auth
- API_KEY
- Tools
- 3
- Composio slug
genderize
Tools
- Batch Predict Gender with Localization
Tool to predict genders for a batch of names with optional country localization. Use after gathering 1-10 first names when needing localized gender estimates by country.
- Predict Gender
Tool to predict gender from a given first name. Use when you need a quick gender estimation possibly localized by country code.
- Predict Gender Batch
Tool to predict gender for multiple names in a single request. Use when batch gender predictions for several names at once.
Setup
Setup guide
- 11. In Switchy, open your workspace settings and navigate to the MCP Integrations page. 2. Click 'Add Integration' and select Genderize from the developer tools category. 3. Visit genderize.io, sign up for an account, and copy your API key from the dashboard. 4. Paste the key into Switchy's auth field and click 'Connect'. 5. Open any Space, type '@Genderize predict gender for the name Alex' and send the message. 6. If the MCP replies with a gender estimate and probability score, the connection is working. 7. To test batch processing, try '@Genderize predict gender batch for Jordan, Taylor, Casey' and confirm you receive results for all three names.
What teammates see: by default, memories from Genderize are scoped to the Space (PROJECT visibility) - you can mark any memory PRIVATE or share it ORG-wide.
Works well with
Top models
Compatibility data appears once enough Spaces have used this MCP together with a given model.
How Switchy teams use it
Starter prompts
Single Name Lookup
@Genderize predict gender for the name Morgan and tell me the probability score.Open in a Space →
Batch Campaign Prep
@Genderize predict gender batch for these names: Jamie, River, Skylar, Avery, Dakota. Show me the results in a table.Open in a Space →
Localized Prediction
@Genderize predict gender for the name Andrea with country code IT, then compare it to the same name in the US.Open in a Space →
Hiring Pipeline Audit
@Genderize batch predict gender with localization for these applicant names in Germany: Alex, Sam, Chris, Jordan, Taylor. Summarize the gender split.Open in a Space →
CRM Data Enrichment
@Genderize predict gender batch for Casey, Riley, Quinn, Sage, Rowan and format the output as CSV so I can import it into our CRM.Open in a Space →
Example outputs
Illustrative - representative of the model's voice and quality, not literal recordings.
@Genderize what's the predicted gender distribution for the names Emma, Liam, and Yuki?
Based on Genderize's database, here's what I found: Emma is predicted female with 99.6% probability (sample size: 214,000+ records). Liam is predicted male with 99.8% probability (sample size: 89,000+ records). Yuki shows 54% male probability (sample size: 1,200+ records), indicating this name has more gender variance, likely due to its use across different cultures. These predictions reflect historical naming patterns in Genderize's dataset.
This example shows the batch prediction capability returning probability scores and sample sizes. Note that gender prediction accuracy varies significantly by cultural context — names like Yuki that span multiple regions show lower confidence. The API returns statistical likelihoods, not deterministic classifications, and should never be used for identity verification or assumptions about individuals.
@Genderize I have a list of 8 customer first names from our Japan market signup form — can you predict gender with JP localization: Haruto, Sakura, Ren, Hina, Sora, Yui, Kaito, Aoi
Using country code JP for localization, here are the predictions: Haruto (male, 98%), Sakura (female, 99%), Ren (male, 89%), Hina (female, 97%), Sora (male, 71%), Yui (female, 99%), Kaito (male, 99%), Aoi (female, 68%). The localization significantly improves accuracy for names like Sora and Aoi, which have different gender associations in Japan versus other regions. All predictions include probability scores reflecting confidence levels from the Japan-specific dataset.
This demonstrates the batch localization feature, which is critical for names that vary by country. Providing a country code (ISO 3166-1 alpha-2) dramatically improves prediction quality for culturally-specific names. The API key tier determines your monthly request limit — batch requests count as one call per name, so this example consumes 8 requests. Always validate that localization is appropriate for your use case.
@Genderize analyze our new user signups from last week and tell me if there's a gender skew in our European markets versus North American markets based on first names
I've processed the 47 first names from your signup data with regional localization. European signups (country codes: DE, FR, ES, IT) show 62% predicted male, 38% predicted female based on name patterns. North American signups (US, CA) show 51% predicted male, 49% predicted female, nearly balanced. The European skew is driven primarily by German and French signups. Important caveat: these are statistical predictions from names, not actual demographic data — they reflect naming conventions, not user identity, and should be interpreted as rough market signals only.
This synthesis example combines the MCP's batch prediction with AI reasoning to surface patterns across datasets. It showcases how gender prediction can inform market analysis when used appropriately. Critical limitation: this analysis makes statistical inferences from names, which is fundamentally different from knowing actual user demographics. Use only for aggregate trend analysis, never for individual profiling or targeting. Requires sufficient API quota for the batch size.
Use-case deep-dives
When Genderize fits early-stage SaaS onboarding flows
A 6-person B2B SaaS team wants to personalize welcome emails without asking users to select pronouns in signup. Genderize works here if your user base skews Western European or North American—its name-to-gender predictions hit 85-90% accuracy in those regions. The batch tool handles up to 10 names per call, so you can process a day's signups in one request during your nightly job. The country localization matters: "Andrea" reads male in Italy, female in the US. If your product serves global markets or you're handling 500+ signups daily, the API key cost scales fast and accuracy drops in non-Western contexts. For small teams with predictable geography, it's a low-friction personalization win that doesn't add form fields.
Genderize as a stopgap for incomplete sales records
A 3-person sales team inherits a HubSpot instance with 2,000 contacts missing gender fields, and their email sequences rely on gendered salutations. Genderize's batch predict tool can backfill this in an afternoon—upload first names, get predictions, merge back into the CRM. The trade-off: you're guessing, and roughly 10-15% of predictions will be wrong or low-confidence. If your outreach is high-volume and low-touch (cold email campaigns), that error rate is tolerable. If you're doing enterprise sales where one botched pronoun kills a deal, don't automate this—ask humans or skip gendered language entirely. Genderize is the right call when speed matters more than perfection and your contact list is under 10k records.
When Genderize supports qualitative research at small scale
A university research team is coding 800 survey responses by inferred gender to analyze participation patterns in open-source communities. Genderize's single-name prediction tool lets them script the coding in an hour instead of manual tagging over days. The country localization helps when respondents list location—"Kim" in South Korea vs. "Kim" in the US. The boundary: if your research will be published or peer-reviewed, Genderize's probabilistic guesses won't pass IRB scrutiny without disclosure of error rates and methodology. Use it for exploratory analysis or internal reports where approximate demographics inform next steps, not conclusions. For 800 names, the API cost is under $10, making it a reasonable shortcut for unfunded or early-stage academic work.
Frequently asked
What does the Genderize MCP do in Switchy?
It predicts likely gender from first names, optionally filtered by country. You feed it one name or a batch of up to ten, and it returns probability scores based on historical data. Useful for enriching contact lists, segmenting audiences, or filling in missing profile fields without manual guesswork.
Do I need a paid Genderize account to use this MCP?
You need an API key from Genderize. Their free tier covers 1,000 requests per day. If your team runs larger batches or needs higher throughput, you'll hit that limit fast and need a paid plan. Switchy passes your key through; we don't provide one.
Can the Genderize MCP handle non-English names accurately?
Yes, if you pass a two-letter country code with the name. The localization parameter narrows predictions to regional naming patterns, so "Andrea" in Italy skews male while in the US it skews female. Without the country hint, you get a global average that may be less useful.
How does this compare to calling the Genderize API directly?
It's the same data, but the MCP wraps it in Switchy's prompt context so your AI can request predictions mid-conversation without you writing fetch calls. If you're already piping names through a script, stick with the API. If you want conversational enrichment, use the MCP.
Who on the team should connect the Genderize MCP?
Whoever owns your Genderize API key and understands your data-privacy rules around inferring gender. Marketing ops or data analysts typically manage this. Once connected, any Switchy user in your workspace can invoke it, so set expectations about appropriate use cases before you share access.