Based on looking at the website, Sigmabookmarketers.com presents itself as a comprehensive solution for self-published authors and indie writers, offering a suite of services from ghostwriting and editing to publishing and marketing.

The site emphasizes its smart, strategic, and proven marketing approaches, aiming to help authors sell more books.

They claim to be trusted by over 1,000 authors, boasting 5-star ratings on Trustpilot and Google, 10+ years of industry experience, and over 100,000 books sold through their campaigns. sigmabookmarketers.com FAQ

The overall presentation is professional, with clear calls to action for free quotes and consultations.

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Here’s an overall review summary:

Website Professionalism: The website appears well-designed, with a clean layout, clear navigation, and consistent branding. The language used is persuasive and professional, aiming to build trust with potential clients.
Service Offerings: Sigmabookmarketers.com outlines a broad range of services essential for authors, including E-Book Publishing, Ghostwriting, Editing & Proofreading, Custom Cover Design, eBook Conversion, Author Branding, Marketing & Promotion, Audiobook Production, and ISBN & Copyright Assistance. They also break down core services like Book Writing Support, Social Media Marketing, Author Branding, Publishing Guidance, Proofreading & Editing, Formatting & Interior Layout, and Cover Design.
Trust Signals: The site displays several trust builders, such as “Trusted by 1,000+ Authors,” “5-Star Rated on Trustpilot & Google,” “10+ Years of Industry Experience,” and “100,000+ Books Sold Through Our Campaigns.” Testimonials from supposedly happy authors are also prominently featured, providing specific praise for different aspects of their service, like visibility, editing, cover design, and social media campaigns.
Process Transparency: They detail a four-step process: Free Consultation, Custom Strategy, Launch & Promote, and Track & Optimize. This provides a clear roadmap for potential clients, outlining what to expect from engagement to results.
Contact Information: Multiple phone numbers +1 818 857-4251, +1 315 216 3356 and an email address [email protected] are provided. A physical address 780 Third Avenue, 10017, New York, United States is also listed, which adds a layer of legitimacy. Social media links for Facebook, Instagram, and X Twitter are present.
Legal Pages: The website includes links to “Terms & Conditions” and “Privacy Policy,” which are crucial for any legitimate online business, demonstrating a commitment to legal compliance and user data protection.
Missing Information: While the website presents itself well, a key element often found on trusted and highly transparent business websites is a detailed “About Us” page that introduces the team, their qualifications, and their specific experience beyond generic claims. While “10+ Years of Industry Experience” is mentioned, the lack of specific team profiles or detailed company history makes it difficult to fully assess the depth of expertise. Furthermore, while testimonials are present, the absence of third-party verification links directly on the testimonials beyond just mentioning Trustpilot and Google can raise a slight eyebrow for the truly discerning. For a service that hinges on trust and results, more verifiable proof of their claims, such as case studies with measurable outcomes or direct links to the published books they claim to have worked on, would significantly enhance credibility.

Find detailed reviews on Trustpilot, Reddit, and BBB.org, for software products you can also check Producthunt.

IMPORTANT: We have not personally tested this company’s services. This review is based solely on information provided by the company on their website. For independent, verified user experiences, please refer to trusted sources such as Trustpilot, Reddit, and BBB.org. Sigmabookmarketers.com Alternatives

Best Alternatives for Author Services:

For authors seeking ethical, professional, and transparent assistance with publishing and marketing, here are some alternatives that align with a commitment to integrity and quality:

Reedsy
- Key Features: Connects authors with a curated marketplace of publishing professionals editors, designers, publicists, ghostwriters. Offers free educational content and tools. Transparent pricing and secure payment system.
- Average Price: Varies widely based on service and professional. Editing can range from $0.01-$0.04 per word, cover design $500-$1500.
- Pros: High-quality professionals, transparent quotes, secure platform, good for all stages of publishing.
- Cons: Can be expensive, requires active author involvement in vetting professionals.
BookBaby
- Key Features: Comprehensive publishing packages including editing, design, printing, eBook conversion, and worldwide distribution. Offers marketing services and a book store.
- Average Price: Packages start from a few hundred dollars to several thousand, depending on included services.
- Pros: All-in-one solution, wide distribution, good customer support, physical book printing options.
- Cons: Less flexible than hiring individual freelancers, some services may be pricier than à la carte.
Self-Publishing School Chandler Bolt
- Key Features: Provides courses, coaching, and community support for authors through every step of the self-publishing process, from writing to marketing. Focuses on education and empowering authors.
- Average Price: Programs can range from $2,000 to $10,000+.
- Pros: Excellent educational resources, strong community, hands-on guidance, teaches authors to be self-sufficient.
- Cons: Primarily an educational platform, not a direct service provider for tasks like editing/design though they guide you to them.
KDP Kindle Direct Publishing
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- Key Features: Amazon’s direct publishing platform for eBooks and print-on-demand paperbacks. Free to use, offers global distribution through Amazon.
- Average Price: Free to publish, royalties depend on pricing and distribution.
- Pros: Widest reach for online book sales, easy to use, fast publishing process.
- Cons: No direct support for editing or design requires authors to find their own professionals, intense competition.
Draft2Digital
- Key Features: Free eBook and print-on-demand distribution to major retailers Apple Books, Barnes & Noble, Kobo, etc.. Offers free formatting and conversion tools.
- Average Price: Free for distribution, they take a small percentage of sales.
- Pros: Wide distribution, user-friendly interface, good reporting, free formatting.
- Cons: Does not offer editing, cover design, or marketing services. purely a distribution platform.
Scribd Self-Publishing
- Key Features: A digital library that allows authors to upload their works for a global audience. Offers a subscription model for readers.
- Average Price: Free to upload, authors earn royalties based on readership.
- Pros: Access to a large, engaged reading audience, simple upload process, digital distribution.
- Cons: Not a primary publishing platform. more of a complementary distribution channel.
Author Marketing Experts, Inc.
- Key Features: A long-standing book marketing firm offering tailored publicity, social media campaigns, book launches, and author platform building. Focuses heavily on media relations and PR.
- Average Price: Varies widely, usually custom quotes based on campaign scope can be several thousand dollars.
- Pros: Expert-level marketing and PR, strong industry connections, personalized strategies.
- Cons: Focuses solely on marketing. does not offer ghostwriting, editing, or design services directly. Typically for authors who already have a published or ready-to-publish book.

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